Comment 8 for bug 155393

I cannot browse the internet at all, after upgrading to gutsy. Disabling IPv6 at Firefox solved the problem for it. I still can't use apt-get or any other application that needs internet. There seems to be a DNS resolving problem between Gutsy and my Router (Telindus 1132 ADSL Router). I have done all the things mentioned in several threads at ubuntuforums.org, like changing to static IP, changing /etc/modprobe.d/aliases, blacklisting ipv6, changing Network Manager's dns... Issuing the command ip a | grep inet6, returns no results, which means that IPv6 is disabled, but still no internet.
Then I tried a different Router (Speedtouch) and everything worked fine from the beginning! I need to mention that I was using my Telindus Router with Feisty having no problems at all.