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.
Best Regards, Rigved