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Im with Ubuntu 12.04 - Dell Inspiron 5110 (8g ram, i7 cpu). When I connect to a router at my place, i get an internal IP i can ping others in the network (and the router), but have no internet. I trided by checking with trough FF, IE and Opera and couldn't load any pages. I read all other similar topics and nothing helped.

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Check if DHCP server is giving you nameservers. In terminal window type:

cat /etc/resolv.conf

My resolv.conf: 

# Generated by NetworkManager
nameserver 192.168.0.1

If not, the simply solution is adding nameservers by hand. However, if you experience this, you have a problem in DHCP Server.

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It happened again :(. Actually the problem is quite weird, because in Windows my Internet is perfect and in ubuntu i get up to 10000ms ping to the router. I tried pinging 8.8.8.8 - the same story (up to 1s - but it responds). Now I'll restart to Ubuntu and check this command. – Martin Jun 5 '12 at 8:14
I'm in Ubuntu but now it's OK Oo. I will type this command when it breaks again – Martin Jun 5 '12 at 8:20
it returned nameserver 127.0.0.1 and there was a message telling not to edit the file because the content will be overwritten – Martin Jun 5 '12 at 12:08
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Ok. put this in /etc/network/interfaces : dns-nameservers [IP address(es) of your DNS] dns-search [your dns-search strings (optional)] – Subv3rsion Jun 5 '12 at 12:11
I found out that when this problem occurs - I actually can browse to google.com but with extremely high latency. My ping to router is 2-10k ms. Seems something is interrupting my wifi connection. However when I connect trough Windows my ping to the router is about 20-100ms And my Internet becomes a bit slower as well. Is there way to define a different channel in Ubuntu to work like in Windows or something like this. – Martin Jun 6 '12 at 7:51

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