Tente instalar o php-mbstring na configuração do mediawiki.
já foi adicionado após a primeira tentativa de repositório do universo: Pacote php7.2-mbstring ausente no Ubuntu 18.04
Mas me dá dificuldade aqui detalhes:
usertilo@myserver4:~$ sudo apt-get install php-mbstring
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
php-mbstring : Depends: php7.2-mbstring but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
usertilo@myserver4:~$ sudo apt-get install php7.2-mbstring
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
php7.2-mbstring : Depends: php7.2-common (= 7.2.3-1ubuntu1) but 7.2.7-0ubuntu0.18.04.2 is to be installed
E: Unable to correct problems, you have held broken packages.
usertilo@myserver4:~$ uname -a
Linux myserver4 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
usertilo@myserver4:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic
usertilo@myserver4:~$ sudo apt-get install -f
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
usertilo@server4:~$ sudo apt-get install php7.2-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
php7.2-common is already the newest version (7.2.7-0ubuntu0.18.04.2).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
- atualizar adicionar informações solicitadas dos comentários
usertilo@myserver4:~$ sudo apt-cache policy php7.2-common php7.2-mbstring
php7.2-common:
Installed: 7.2.7-0ubuntu0.18.04.2
Candidate: 7.2.7-0ubuntu0.18.04.2
Version table:
*** 7.2.7-0ubuntu0.18.04.2 500
500 http://archive.ubuntu.com/ubuntu bionic-security/main amd64 Packages
500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
7.2.3-1ubuntu1 500
500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
php7.2-mbstring:
Installed: (none)
Candidate: 7.2.3-1ubuntu1
Version table:
7.2.3-1ubuntu1 500
500 http://archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
usertilo@myserver4:~$ cat /etc/apt/sources.list
deb http://archive.ubuntu.com/ubuntu bionic main universe
deb http://archive.ubuntu.com/ubuntu bionic-security main
# deb-src http://archive.ubuntu.com/ubuntu bionic universe
deb http://archive.ubuntu.com/ubuntu bionic-updates main
usertilo@myserver4:~$ cat /etc/apt/sources.list.d/*
cat: '/etc/apt/sources.list.d/*': No such file or directory
/etc/apt/sources.list
? E a mesma pergunta para as fontes em /etc/apt/sources.list.d/*
. Essas são as fontes das quais você obtém todos os seus pacotes. Portanto, verifique se tudo está bem. Obtenha o repositório do pacote que você deseja instalar e verifique se você tem sua fonte nas listas mencionadas.
apt-cache policy php7.2-common php7.2-mbstring
(Além disso, para sua informação, o Universo está ativado por padrão em Ubuntu 18.04)