La connessione cablata Ubuntu 14.04 è stata rilevata ma non dispone di accesso a Internet

Non ho connessione via cavo a Internet su ubuntu 14.04 anche se viene rilevato, il mio computer connesso allo stesso router ha.

$ ifconfig eth0 Link encap:Ethernet HWaddr 4c:72:b9:7e:b5:61 inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::4e72:b9ff:fe7e:b561/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:93 errors:0 dropped:0 overruns:0 frame:0 TX packets:705 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:18292 (18.2 KB) TX bytes:76277 (76.2 KB) Interrupt:17 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:701 errors:0 dropped:0 overruns:0 frame:0 TX packets:701 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:54442 (54.4 KB) TX bytes:54442 (54.4 KB) wlan0 Link encap:Ethernet HWaddr 08:3e:8e:5f:56:1e UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) 

Buona. Allora non hai i nameserver DNS. Aggiungere queste due righe a /etc/resolv.conf :

  nameserver 8.8.8.8 nameserver 8.8.4.4 

e dovrebbe funzionare.