Como evito que meu Wifi saia?

Eu tenho um System76 Gazelle, gapz8, executando o Ubuntu 14.04. Meu wifi continua saindo em intervalos aleatórios. Eu tenho um novo roteador, então não acredito que esse seja o problema, mas estou em um prédio de apartamentos, portanto os sinais provavelmente estão lotados. Meu computador ainda registra o wifi como conectado, mas para de enviar e receber dados. Descobri que desconectar do wifi e reconectar corrige o problema, mas isso pode acontecer novamente em poucos minutos. Alguém entende o problema ou como corrigi-lo? Fico feliz em fornecer mais informações, se isso esclarecer o problema, é só me dizer o que.

Conforme solicitado abaixo, os resultados do "script sem fio" "

########## informações sem fio START ##########

Relatório de: 28 de setembro de 2014 23:17 EDT -0400

Última inicialização: 28 de setembro de 2014 20:28 EDT -0400

Script de: 20 de setembro de 2014 23:04 UTC +0000

##### liberação ###########################

ID do Distribuidor: Ubuntu
Descrição: Ubuntu 14.04.1 LTS
Lançamento: 14.04
Codinome: confiável

##### núcleo ############################

Linux 3.13.0-36-generic # 63-Ubuntu SMP Wed Sep 3 21:30:07 UTC 2014 x86_64 x86_64 x86_64 GNU / Linux

Parâmetros: ro, quiet, splash, acpi_os_name = Linux, acpi_osi =, vt.handoff = 7

##### Área de Trabalho ###########################

Ubuntu

##### lspci #############################

02: 00.0 Controlador de rede [0280]: Intel Corporation Centrino Wireless-N 2230 [8086: 0887] (rev c4)
    Subsistema: Intel Corporation Centrino Wireless-N 2230 BGN [8086: 4062]
    Driver de kernel em uso: iwlwifi

03: 00.2 Controlador Ethernet [0200]: Realtek Semiconductor Co., Ltd. Controlador Ethernet Gigabit RTL8111 / 8168/8411 PCI Express [10ec: 8168] (rev 0a)
    Subsistema: Dispositivo de computador CLEVO / KAPOK [1558: 2706]
    Driver de kernel em uso: r8169

##### lsusb #############################

Dispositivo 003 do barramento 002: ID 5986: 0401 Acer, Inc 
Dispositivo 002 do barramento 002: ID 8087: 0024 Hub de correspondência de taxa integrado da Intel Corp.
Dispositivo 001 do barramento 002: hub raiz do ID 1d6b: 0002 Linux Foundation 2.0
Dispositivo 002 do barramento 001: ID 8087: 0024 Hub correspondente da taxa integrada da Intel Corp
Dispositivo 001 do barramento 001: hub raiz do ID 1d6b: 0002 Linux Foundation 2.0
Dispositivo 001 do barramento 004: hub raiz do ID 1d6b: 0003 Linux Foundation 3.0
Dispositivo 002 do barramento 003: ID 045e: 00e1 Receptor de mouse a laser sem fio da Microsoft Corp.
Dispositivo 001 do barramento 003: hub raiz do ID 1d6b: 0002 Linux Foundation 2.0

##### Informações do cartão PCMCIA ##################

##### rfkill ############################

0: phy0: LAN sem fio
    Bloqueado suave: não
    Bloqueado: não

##### lsmod #############################

iwldvm 232285 0 
mac80211 630653 1 iwldvm
iwlwifi 169932 1 iwldvm
cfg80211 484040 3 iwlwifi, mac80211, iwldvm
wmi 19177 0 

##### interfaces ########################

auto lo
iface lo inet loopback

##### ifconfig ##########################

eth0 Encap de link: Ethernet HWaddr   
          UP BROADCAST MULTICAST MTU: 1500 Métrico: 1
          Pacotes RX: 0 erros: 0 eliminados: 0 excedentes: 0 quadro: 0
          Pacotes TX: 0 erros: 0 eliminados: 0 excedentes: 0 transportadora: 0
          colisões: 0 txqueuelen: 1000 
          Bytes RX: 0 (0,0 B) Bytes TX: 0 (0,0 B)

wlan0 Encap de link: Ethernet HWaddr   
          endereço inet: 192.168.1.5 Bcast: 192.168.1.255 Máscara: 255.255.255.0
          Endereço do inet6: fe80 :: 626c: 66ff: fe30: 1786/64 Escopo: Link
          UP BROADCAST EM FUNCIONAMENTO MULTICAST MTU: 1500 Métrico: 1
          Pacotes RX: 132928 erros: 0 eliminados: 0 excedentes: 0 quadro: 0
          Pacotes TX: 81169 erros: 0 eliminados: 0 excedentes: 0 transportadora: 0
          colisões: 0 txqueuelen: 1000 
          Bytes RX: 167705002 (167,7 MB) Bytes TX: 10766737 (10,7 MB)

##### iwconfig ##########################

eth0 sem extensões sem fio.

lo sem extensões sem fio.

wlan0 IEEE 802.11bgn ESSID: "Roteador 2: Boogaloo elétrico"  
          Modo: Freqüência gerenciada: 2.417 GHz Ponto de acesso:    
          Taxa de bits = 65 Mb / s Tx-Power = 16 dBm   
          Repetir limite longo: 7 RTS thr: off Fragmento thr: off
          Gerenciamento de energia: desativado
          Qualidade do link = 63/70 Nível de sinal = -47 dBm  
          Rx inválido nwid: 0 Rx inválido criptografia: 0 Rx inválido frag: 0
          Tentativas excessivas de TX: 0 Misc inválido: 67 Farol ausente: 0

##### rota #############################

Tabela de roteamento IP do kernel
Gateway de destino Sinalizadores de máscara de máscara Referência métrica Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 wlan0
192.168.1.0 0.0.0.0 255.255.255.0 U 9 0 0 wlan0

##### resolv.conf #######################

nameserver 127.0.1.1

##### nm-tool ###########################

Ferramenta NetworkManager

Estado: conectado (global)

- Dispositivo: eth0 ---------------------------------------------- -------------------
  Tipo: Com fio
  Driver: r8169
  Estado: indisponível
  Padrão: não
  Endereço HW:        

  Recursos:
    Detecção de operadora: sim

  Propriedades com fio
    Transportadora: desativada

- Dispositivo: wlan0 [Roteador 2: Boogaloo elétrico] ---------------------------------
  Tipo: WiFi 802.11
  Driver: iwlwifi
  Estado: conectado
  Padrão: sim
  Endereço HW:        

  Recursos:
    Velocidade: 115 Mb / s

  Propriedades sem fio
    Criptografia WEP: sim
    Criptografia WPA: sim
    Criptografia WPA2: sim

  Pontos de acesso sem fio (* = AP atual)
    Lucille: Infra, Freq 2427 MHz, taxa 54 Mb / s, força 75 WPA WPA2
    DG1670A82: Infra, Freq 2437 MHz, taxa 54 Mb / s, força 62 WPA2
    Mcchacko-2G: Infra, Freq 2412 MHz, taxa 54 Mb / s, força 52 WPA2
    DIRECT-roku-900: Infra, Freq 2437 MHz, taxa 54 Mb / s, força 50 WPA2
    B4R87: Infra, Freq 2437 MHz, taxa 54 Mb / s, força 44 WPA2
    NETGEAR65: Infra, Freq 2437 MHz, taxa 54 Mb / s, força 42 WPA2
    atrevido: Infra, Freq 2462 MHz, taxa 54 Mb / s, força 27 WPA2
    DG1670A22: Infra, Freq 2412 MHz, taxa 54 Mb / s, força 25 WPA2
    * Roteador 2: Boogaloo elétrico: Infra, Freq 2417 MHz, taxa 54 Mb / s, força 77 WPA2
    Wellfords: Infra, Freq 2412 MHz, taxa 54 Mb / s, força 57 WPA WPA2
    RubyWillow: Infra, Freq 2437 MHz, taxa 54 Mb / s, força 40 WPA WPA2
    Waffle House: Infra, Freq 2412 MHz, taxa 54 Mb / s, força 27 WPA WPA2
    Linksys e3200: Infra, Freq 2412 MHz, taxa 54 Mb / s, força 27 WPA WPA2
    Convidado do RubyWillow: Infra, Freq 2437 MHz, taxa 54 Mb / s, força 45
    TG1672G12: Infra, Freq 2427 MHz, taxa 54 Mb / s, força 34 WPA2
    55B2Q: Infra, Freq 2462 MHz, taxa 54 Mb / s, força 34 WPA2
    luna: Infra,, Freq 2437 MHz, taxa 54 Mb / s, força 30 WPA WPA2
    Linksys e3200-guest: Infra, Freq 2412 MHz, taxa 54 Mb / s, força 27

  Configurações IPv4:
    Endereço: 192.168.1.5
    Prefixo: 24 (255.255.255.0)
    Gateway: 192.168.1.1

    DNS: 192.168.1.1

##### NetworkManager.state ##############

[a Principal]
NetworkingEnabled = true
WirelessEnabled = true
WWANEnabled = true
WimaxEnabled = true

##### NetworkManager.conf ################

[a Principal]
plugins = ifupdown, keyfile, ofono
dns = dnsmasq

[ifupdown]
managed = false

##### perfis do NetworkManager ############

[/ etc / NetworkManager / conexões do sistema / Apple Network 5df1bd]] (600 root)
[conexão] id = Apple Network 5df1bd | tipo = 802-11-sem fio
[802-11-wireless] ssid = Apple Network 5df1bd | mac-address =
[ipv4] método = automático
[ipv6] method = auto

[/ etc / NetworkManager / conexões do sistema / 200W102nd3E]] (600 root)
[conexão] id = 200W102nd3E | tipo = 802-11-sem fio
[802-11-wireless] ssid = 200W102nd3E | mac-address =
[ipv4] método = automático
[ipv6] method = auto

[[/ etc / NetworkManager / conexões do sistema / NETGEAR49]] (600 root)
[conexão] id = NETGEAR49 | tipo = 802-11-sem fio
[802-11-wireless] ssid = NETGEAR49 | mac-address =
[ipv4] método = automático
[ipv6] method = auto

[/ etc / NetworkManager / conexões do sistema / NYU-ROAM3]] (600 root)
[conexão] id = NYU-ROAM3 | tipo = 802-11-sem fio
[802-11-wireless] ssid = NYU-ROAM3 | mac-address =
[ipv6] method = auto
[ipv4] método = automático

[/ etc / NetworkManager / conexões do sistema / Roteador 2: Boogaloo elétrico]] (600 root)
[conexão] id = Roteador 2: Boogaloo elétrico | tipo = 802-11-sem fio
[802-11-wireless] ssid = Roteador 2: Boogaloo elétrico | mac-address =
[ipv4] método = automático
[ipv6] method = auto

##### iw reg get ########################

Região: America / New_York (com base no fuso horário definido)

país 00:
    (2402 - 2472 @ 40), (3, 20)
    (2457 - 2482 a 40), (3, 20), DIGITALIZAÇÃO PASSIVA, NO-IBSS
    (2474 - 2494 @ 20), (3, 20), NO-OFDM, PASSIVE-SCAN, NO-IBSS
    (5170 - 5250 @ 40), (3, 20), DIGITALIZAÇÃO PASSIVA, NO-IBSS
    (5735 - 5835 @ 40), (3, 20), DIGITALIZAÇÃO PASSIVA, NO-IBSS

##### Canais da lista de opções ###################

eth0 nenhuma informação de frequência.

lo nenhuma informação de frequência.

wlan0 13 canais no total; frequências disponíveis:
          Canal 01: 2.412 GHz
          Canal 02: 2.417 GHz
          Canal 03: 2.422 GHz
          Canal 04: 2.427 GHz
          Canal 05: 2.432 GHz
          Canal 06: 2.437 GHz
          Canal 07: 2.442 GHz
          Canal 08: 2.447 GHz
          Canal 09: 2.452 GHz
          Canal 10: 2.457 GHz
          Canal 11: 2.462 GHz
          Canal 12: 2.467 GHz
          Canal 13: 2.472 GHz
          Frequência Atual: 2.417 GHz (Canal 2)

##### varredura da lista de verificação #######################

Ocupação do canal:

      2 APs em Frequência: 2.412 GHz (Canal 1)
      1 APs em Frequência: 2.417 GHz (Canal 2)
      1 APs em Frequência: 2.427 GHz (Canal 4)
      7 PAs na frequência: 2.437 GHz (canal 6)
      1 pontos de acesso na frequência: 2.457 GHz (canal 10)
      1 APs em Frequência: 2.462 GHz (Canal 11)

A interface eth0 não suporta digitalização.

A interface não suporta digitalização.

Verificação concluída:
          Célula 01 - Endereço: 
                    Canal: 2
                    Frequência: 2.417 GHz (Canal 2)
                    Qualidade = 60/70 Nível de sinal = -50 dBm  
                    Chave de criptografia: ativada
                    ESSID: "Roteador 2: Boogaloo elétrico"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 6 Mb / s
                              9 Mb / s; 12 Mb / s; 18 Mb / s
                    Taxas de bits: 24 Mb / s; 36 Mb / s; 48 Mb / s; 54 Mb / s
                    Modo: Mestre
                    Extra: tsf = 0000000226ee9d93
                    Extra: Último farol: 44ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: CCMP
                        Cifras emparelhadas (1): CCMP
                        Conjuntos de autenticação (1): PSK
          Célula 02 - Endereço: 
                    Canal: 1
                    Frequência: 2.412 GHz (Canal 1)
                    Qualidade = 44/70 Nível de sinal = -66 dBm  
                    Chave de criptografia: ativada
                    ESSID: "Mcchacko-2G"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 9 Mb / s
                              18 Mb / s; 36 Mb / s; 54 Mb / s
                    Taxas de bits: 6 Mb / s; 12 Mb / s; 24 Mb / s; 48 Mb / s
                    Modo: Mestre
                    Extra: tsf = 00000051d26350a2
                    Extra: Último farol: 44ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: CCMP
                        Cifras emparelhadas (1): CCMP
                        Conjuntos de autenticação (1): PSK
          Célula 03 - Endereço: 
                    Canal: 1
                    Frequência: 2.412 GHz (Canal 1)
                    Qualidade = 48/70 Nível de sinal = -62 dBm  
                    Chave de criptografia: ativada
                    ESSID: "Wellfords"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 18 Mb / s
                              24 Mb / s; 36 Mb / s; 54 Mb / s
                    Taxas de bits: 6 Mb / s; 9 Mb / s; 12 Mb / s; 48 Mb / s
                    Modo: Mestre
                    Extra: tsf = 00000000bfdb08ba
                    Extra: Último farol: 44ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: TKIP
                        Cifras em pares (2): CCMP TKIP
                        Conjuntos de autenticação (1): PSK
                    IE: Versão 1 do WPA
                        Cifra de grupo: TKIP
                        Cifras em pares (2): CCMP TKIP
                        Conjuntos de autenticação (1): PSK
          Célula 04 - Endereço: 
                    Canal: 4
                    Frequência: 2.427 GHz (Canal 4)
                    Qualidade = 58/70 Nível de sinal = -52 dBm  
                    Chave de criptografia: ativada
                    ESSID: "Lucille"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 6 Mb / s
                              9 Mb / s; 12 Mb / s; 18 Mb / s
                    Taxas de bits: 24 Mb / s; 36 Mb / s; 48 Mb / s; 54 Mb / s
                    Modo: Mestre
                    Extra: tsf = 0000001d3ad33a1d
                    Extra: Último farol: 44ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: TKIP
                        Cifras em pares (2): CCMP TKIP
                        Conjuntos de autenticação (1): PSK
                    IE: Versão 1 do WPA
                        Cifra de grupo: TKIP
                        Cifras em pares (2): CCMP TKIP
                        Conjuntos de autenticação (1): PSK
          Célula 05 - Endereço: 
                    Canal: 6
                    Frequência: 2.437 GHz (Canal 6)
                    Qualidade = 44/70 Nível de sinal = -66 dBm  
                    Chave de criptografia: ativada
                    ESSID: "RubyWillow"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 18 Mb / s
                              24 Mb / s; 36 Mb / s; 54 Mb / s
                    Taxas de bits: 6 Mb / s; 9 Mb / s; 12 Mb / s; 48 Mb / s
                    Modo: Mestre
                    Extra: tsf = 000000d59bbc1370
                    Extra: Último farol: 44ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: TKIP
                        Cifras em pares (2): CCMP TKIP
                        Conjuntos de autenticação (1): PSK
                    IE: Versão 1 do WPA
                        Cifra de grupo: TKIP
                        Cifras em pares (2): CCMP TKIP
                        Conjuntos de autenticação (1): PSK
          Célula 06 - Endereço: 
                    Canal: 6
                    Frequência: 2.437 GHz (Canal 6)
                    Qualidade = 50/70 Nível de sinal = -60 dBm  
                    Chave de criptografia: ativada
                    ESSID: "NETGEAR65"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 6 Mb / s
                              9 Mb / s; 12 Mb / s; 18 Mb / s
                    Taxas de bits: 24 Mb / s; 36 Mb / s; 48 Mb / s; 54 Mb / s
                    Modo: Mestre
                    Extra: tsf = 000002fda7d406be
                    Extra: Último farol: 44ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: CCMP
                        Cifras emparelhadas (1): CCMP
                        Conjuntos de autenticação (1): PSK
          Célula 07 - Endereço: 
                    Canal: 6
                    Frequência: 2.437 GHz (Canal 6)
                    Qualidade = 32/70 Nível de sinal = -78 dBm  
                    Chave de criptografia: ativada
                    ESSID: "luna"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 6 Mb / s
                              9 Mb / s; 12 Mb / s; 18 Mb / s
                    Taxas de bits: 24 Mb / s; 36 Mb / s; 48 Mb / s; 54 Mb / s
                    Modo: Mestre
                    Extra: tsf = 0000000007386e99
                    Extra: Último farol: 692ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: TKIP
                        Cifras em pares (2): CCMP TKIP
                        Conjuntos de autenticação (1): PSK
                    IE: Versão 1 do WPA
                        Cifra de grupo: TKIP
                        Cifras em pares (2): CCMP TKIP
                        Conjuntos de autenticação (1): PSK
          Célula 08 - Endereço: 
                    Canal: 6
                    Frequência: 2.437 GHz (Canal 6)
                    Qualidade = 53/70 Nível de sinal = -57 dBm  
                    Chave de criptografia: ativada
                    ESSID: "DG1670A82"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 9 Mb / s
                              18 Mb / s; 36 Mb / s; 54 Mb / s
                    Taxas de bits: 6 Mb / s; 12 Mb / s; 24 Mb / s; 48 Mb / s
                    Modo: Mestre
                    Extra: tsf = 000002913cbce2ae
                    Extra: Último farol: 44ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: CCMP
                        Cifras emparelhadas (1): CCMP
                        Conjuntos de autenticação (1): PSK
          Célula 09 - Endereço: 
                    Canal: 6
                    Frequência: 2.437 GHz (Canal 6)
                    Qualidade = 41/70 Nível de sinal = -69 dBm  
                    Chave de criptografia: ativada
                    ESSID: "DIRECT-roku-900"
                    Taxas de bits: 6 Mb / s; 9 Mb / s; 12 Mb / s; 18 Mb / s; 24 Mb / s
                              36 Mb / s; 48 Mb / s; 54 Mb / s
                    Modo: Mestre
                    Extra: tsf = 000001bb4835fa76
                    Extra: Último farol: 44ms atrás
                    IE: IEEE 802.11i / WPA2 versão 1
                        Cifra de grupo: CCMP
                        Cifras emparelhadas (1): CCMP
                        Conjuntos de autenticação (1): PSK
          Célula 10 - Endereço: 
                    Canal: 6
                    Frequência: 2.437 GHz (Canal 6)
                    Qualidade = 44/70 Nível de sinal = -66 dBm  
                    Chave de criptografia: desativada
                    ESSID: "convidado RubyWillow"
                    Taxas de bits: 1 Mb / s; 2 Mb / s; 5,5 Mb / s; 11 Mb / s; 18 Mb / s
                              24 Mb / s; 36 Mb / s; 54 Mb / s
                    Taxas de bits: 6 Mb / s; 9 Mb / s; 12 Mb / s; 48 Mb / s
                    Modo: Mestre
                    Extra:tsf=000000d59bbc2e70
                    Extra: Last beacon: 44ms ago
          Cell 11 - Address: 
                    Channel:6
                    Frequency:2.437 GHz (Channel 6)
                    Quality=36/70  Signal level=-74 dBm  
                    Encryption key:on
                    ESSID:"B4R87"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=00000077da1f65f7
                    Extra: Last beacon: 44ms ago
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
          Cell 12 - Address: 
                    Channel:10
                    Frequency:2.457 GHz (Channel 10)
                    Quality=24/70  Signal level=-86 dBm  
                    Encryption key:on
                    ESSID:"Trust but Verify 2"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=0000002b08ecdcda
                    Extra: Last beacon: 480ms ago
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK
          Cell 13 - Address: 
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Quality=30/70  Signal level=-80 dBm  
                    Encryption key:on
                    ESSID:"cheeky"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s
                    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                    Mode:Master
                    Extra:tsf=000001c711ca046e
                    Extra: Last beacon: 44ms ago
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : PSK

##### module infos ######################

[iwldvm]
filename:       /lib/modules/3.13.0-36-generic/kernel/drivers/net/wireless/iwlwifi/dvm/iwldvm.ko
license:        GPL
author:         Copyright(c) 2003-2013 Intel Corporation 
version:        in-tree:
description:    Intel(R) Wireless WiFi Link AGN driver for Linux
srcversion:     CC4D1BA11C1EF73A6ABDE53
depends:        iwlwifi,mac80211,cfg80211
intree:         Y
vermagic:       3.13.0-36-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        38:F3:B6:C6:3A:85:AF:FD:FB:BE:0E:53:33:9D:F8:E0:C6:B6:C9:D5
sig_hashalgo:   sha512

[mac80211]
filename:       /lib/modules/3.13.0-36-generic/kernel/net/mac80211/mac80211.ko
license:        GPL
description:    IEEE 802.11 subsystem
srcversion:     B822641624778B987844F6F
depends:        cfg80211
intree:         Y
vermagic:       3.13.0-36-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        38:F3:B6:C6:3A:85:AF:FD:FB:BE:0E:53:33:9D:F8:E0:C6:B6:C9:D5
sig_hashalgo:   sha512
parm:           max_nullfunc_tries:Maximum nullfunc tx tries before disconnecting (reason 4). (int)
parm:           max_probe_tries:Maximum probe tries before disconnecting (reason 4). (int)
parm:           beacon_loss_count:Number of beacon intervals before we decide beacon was lost. (int)
parm:           probe_wait_ms:Maximum time(ms) to wait for probe response before disconnecting (reason 4). (int)
parm:           ieee80211_default_rc_algo:Default rate control algorithm for mac80211 to use (charp)

[iwlwifi]
filename:       /lib/modules/3.13.0-36-generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
license:        GPL
author:         Copyright(c) 2003-2013 Intel Corporation 
version:        in-tree:
description:    Intel(R) Wireless WiFi driver for Linux
firmware:       iwlwifi-100-5.ucode
firmware:       iwlwifi-1000-5.ucode
firmware:       iwlwifi-135-6.ucode
firmware:       iwlwifi-105-6.ucode
firmware:       iwlwifi-2030-6.ucode
firmware:       iwlwifi-2000-6.ucode
firmware:       iwlwifi-5150-2.ucode
firmware:       iwlwifi-5000-5.ucode
firmware:       iwlwifi-6000g2b-6.ucode
firmware:       iwlwifi-6000g2a-5.ucode
firmware:       iwlwifi-6050-5.ucode
firmware:       iwlwifi-6000-4.ucode
firmware:       iwlwifi-7265-7.ucode
firmware:       iwlwifi-3160-7.ucode
firmware:       iwlwifi-7260-7.ucode
srcversion:     C2D0F3DFCA289585C100E36
depends:        cfg80211
intree:         Y
vermagic:       3.13.0-36-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        38:F3:B6:C6:3A:85:AF:FD:FB:BE:0E:53:33:9D:F8:E0:C6:B6:C9:D5
sig_hashalgo:   sha512
parm:           swcrypto:using crypto in software (default 0 [hardware]) (int)
parm:           11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm:           amsdu_size_8K:enable 8K amsdu size (default 0) (int)
parm:           fw_restart:restart firmware in case of error (default true) (bool)
parm:           antenna_coupling:specify antenna coupling in dB (defualt: 0 dB) (int)
parm:           wd_disable:Disable stuck queue watchdog timer 0=system default, 1=disable, 2=enable (default: 0) (int)
parm:           nvm_file:NVM file name (charp)
parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm:           led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm:           power_save:enable WiFi power management (default: disable) (bool)
parm:           power_level:default power save level (range from 1 - 5, default: 1) (int)

[cfg80211]
filename:       /lib/modules/3.13.0-36-generic/kernel/net/wireless/cfg80211.ko
description:    wireless configuration support
license:        GPL
author:         Johannes Berg
srcversion:     C2478077E22138832B71659
depends:        
intree:         Y
vermagic:       3.13.0-36-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        38:F3:B6:C6:3A:85:AF:FD:FB:BE:0E:53:33:9D:F8:E0:C6:B6:C9:D5
sig_hashalgo:   sha512
parm:           ieee80211_regdom:IEEE 802.11 regulatory domain code (charp)
parm:           cfg80211_disable_40mhz_24ghz:Disable 40MHz support in the 2.4GHz band (bool)

##### module parameters #################

[mac80211]
beacon_loss_count: 7
ieee80211_default_rc_algo: minstrel_ht
max_nullfunc_tries: 2
max_probe_tries: 5
probe_wait_ms: 500

[iwlwifi]
11n_disable: 0
amsdu_size_8K: 0
antenna_coupling: 0
bt_coex_active: Y
fw_restart: Y
led_mode: 0
nvm_file: (null)
power_level: 0
power_save: N
swcrypto: 0
wd_disable: 1

[cfg80211]
cfg80211_disable_40mhz_24ghz: N
ieee80211_regdom: 00

##### /etc/modules ######################

lp
rtc

##### modprobe options ##################

[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci

[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac

[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off

[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211

[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en

##### rc.local ##########################

exit 0

##### pm-utils ##########################

[/etc/pm/power.d/wireless] (755 root)
/sbin/iwconfig wlan0 power off

##### udev rules ########################

[/etc/udev/rules.d/70-persistent-net.rules]
# PCI device 0x10ec:0x8168 (r8169)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x8086:0x0887 (iwlwifi)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

##### dmesg #############################

[ 6007.775779] iwlwifi 0000:02:00.0: RF_KILL bit toggled to enable radio.
[ 6011.128079] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 6011.136901] iwlwifi 0000:02:00.0: Radio type=0x2-0x0-0x0
[ 6011.203681] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 6012.329356] wlan0: authenticate with 
[ 6012.334173] wlan0: send auth to  (try 1/3)
[ 6012.336306] wlan0: authenticated
[ 6012.336744] wlan0: associate with  (try 1/3)
[ 6012.341336] wlan0: RX AssocResp from  (capab=0x431 status=0 aid=3)
[ 6012.364839] wlan0: associated
[ 6012.364893] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 6012.384107] wlan0: deauthenticating from  by local choice (reason=2)
[ 6012.408121] wlan0: authenticate with 
[ 6012.412092] wlan0: send auth to  (try 1/3)
[ 6012.414214] wlan0: authenticated
[ 6012.416765] wlan0: associate with  (try 1/3)
[ 6012.421359] wlan0: RX AssocResp from  (capab=0x431 status=0 aid=3)
[ 6012.443977] wlan0: associated

########## wireless info END ############

Run the following commands, one line at a time in the terminal (CTRL+ALT+T):

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwldvm
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi

What does this do? The 11n_disable option disables 802.11n features. Adding it to /etc/modprobe.d/iwlwifi.conf makes the change persist after reboots (because it will be part of the module config). The modprobe -rfv commands are removing the kernel modules iwldvm and iwlwifi, and finally the last line modprobe -v is adding iwlwifi back in.

To know what those kernel modules are/do, you can run modinfo <module name> | grep description, which will tell you the following:

iwlwifi is an Intel(R) Wireless WiFi driver for Linux (generic Intel drivers)

iwldvm is Intel(R) Wireless WiFi Link AGN driver for Linux (more specific drivers)

Other suggestions

Now, check the settings in the router. WPA2-AES is preferred; not any WPA and WPA2 mixed mode and certainly not TKIP. Second, if your router is capable of N speeds, You may have better luck with a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz. I also have better luck with a fixed channel, either 1, 6 or 11, rather than automatic channel selection. After making these changes, you may need to reboot the router.

Change the wireless setting of IPv6. I tried it with my laptop, which has been continually dropping the connection, and so far, all day long, I have not had a single dropout! It seems to be working. In Ubuntu, in the top right, click on the wireless network icon that shows connectivity. In the dropdown menu, at the bottom, select "edit connections" and then highlight your wireless connection name. Choose edit, then select the IPv6 tab (to the right of the IPv4 tab) and change the setting from "automatic" to "ignore". Save and exit. Reboot your PC. That took care of my problem, and hopefully will yours, too.

Edit the wireless settings, set the IPv6 method to "ignore".

This may be a very simple solution to this problem. My 12.04 wireless connection dropped out every few minutes when connected over Comcast and sometimes also in hotels. This happened consistently on different Comcast wireless setups. On many other wireless setups, it was solid (in my workplace, at Starbucks, for example).

After struggling with many complicated fixes, I finally stumbled across the above solution: No more dropouts.

Edit by cipricus to add images (in KDE Plasma 5.8 interface):

I found a good article on this at: http://itsfoss.com/speed-up-slow-wifi-connection-ubuntu/

I tried steps 1 through 4, but in the end step 5 (installing WICD) is what worked for me.

I'll quote that section here since it's a solution that I didn't see in the prior answers here:

SOLUTION 5: DITCH DEFAULT NETWORK MANAGER AND EMBRACE WICD "Slow or inconsistent wireless connection, in some cases, are also due to Ubuntu’s very own default network manager. I am not sure what causes this but I have seen people in Ubuntu Forums talking about this problem in especially in Ubuntu 12.04. You can install Wicd, an alternate and a better network manager from Ubuntu Software Centre or from terminal. For details on how to use Wicd, you can read my other article which I used to find SSID of wireless networks in Ubuntu."

To clarify, after installing WICD, my WIFI is I think getting disconnected a little less frequently (it was about every 20 minutes), but the big difference is that I previously had to go disable WIFI and then re-enable WIFI to reestablish my internet connection. Now with WICD it just automatically (and pretty much transparently) reconnects within a few seconds.

Hi If you are dual booting or using a PC, firstly ensure your Ethernet does not turn off connection to save power, may not be The Solution but it is one step closer. there are 2 that need turning off. Do this Control Panel/device manager/Network adapters right click Properties / power management/ Un-tick "Allow computer to turn Off this device to save power" Since Windows95 it is always ticked by Default and often when one recovers from a crash it is ticked again and needs to be turned off. Hope it helps

My quick and dirty hack

My wifi adapter (Realtek RTL8188CUS) is just angry with Ubuntu and no real solution worked, so I ping my router every 5s:

ping 192.168.0.1 -i 5

...and the connection stays on.