Hello,
Similar thing I heard from other with different hardware.
Is there issue of drivers with Ubuntu 14.04 or Is there something I
missed?
I haven't heard of such a thing. Infact, more driver support was added
in
14.04.
This was a common problem with previous versions of Ubuntu while
upgrading
from old version to new. So I always used to go with a fresh
installation.
I have upgraded my machine from 12.04 to 14.04 without any problems. The entire version upgrade process in Ubuntu has really improved since 10.04. This is my personal opinion.
May because you upgraded from LTS to LTS or all updates applied to your current version of Ubuntu before you upgrade.
Dear Mr.Rai,
Hope you followed the instructions mentioned here -
https://help.ubuntu.com/community/TrustyUpgrades
Best Regards, Rigved