RTNETLINK responde: Não existe esse processo

Estou tentando excluir meu gateway padrão usando a rota ip -6 .my ifconfig out put is

ifconfig
eth0      Link encap:Ethernet  HWaddr d8:cb:8a:0c:ff:06  
          inet addr:192.168.2.230  Bcast:192.168.7.255  Mask:255.255.248.0
          inet6 addr: 2001:db8::55c8:fca7:f47b:94c2/64 Scope:Global
          inet6 addr: fe80::dacb:8aff:fe0c:ff06/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:260289 errors:0 dropped:0 overruns:0 frame:0
          TX packets:41093 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:56489286 (56.4 MB)  TX bytes:4967963 (4.9 MB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:1263 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1263 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:188712 (188.7 KB)  TX bytes:188712 (188.7 KB)

e a saída de rota ip -6 é

ip -6 route
2001:db8::/64 dev eth0  proto kernel  metric 256 
fe80::/64 dev eth0  proto kernel  metric 256

Quando estou tentando remover 2001: db8 :: / 64. Estou recebendo erro nesse processo

root @ manu-ThinkCentre-E73: / RnD # ip -6 rota de 2001: db8 :: 55c8: fca7: f47b: 94c2 / 64 via 2001: db8 :: dev eth0 respostas RTNETLINK: Não existe esse processo