Comment 25 for bug 1308378

Just in case some people find this bug and still see a similar problem:

It seems like if the original installation is 10.04 LTS, it's possible that 12.04 LTS -> 14.04 LTS will yield similarly non-working name resolving. This is because in 10.04 LTS /etc/resolv.conf was a file, and it was not modified into a symlink during 10.04 LTS -> 12.04 LTS upgrade. While this did not hurt during usage of 12.04 LTS, it starts to break name resolving when the 12.04 LTS is further upgraded to 14.04 LTS.