I am using the same Ethernet card as you.(except that mine is coupled with a ralink wireless card. Which explains the missing (B). I am using a laptop ) Odd that you are having issues. Why don't you try Ultimate Edition 3.5 on your system, but install the newest kernel. Preferably following a guide here on the forums. If you upgrade your system like other Ubuntu systems you will more then likely break it. By the way, 3.5 had KDE. (3.5 is my favorite version because of this. I prefer KDE too. Although Unity is great on laptops. )
Maybe
viewtopic.php?f=7&t=8633
or
viewtopic.php?f=7&t=9038 (MINE )
or
https://www.ultimateeditionoz.com/forum ... =23&t=4806 (liquorix kernel)
All of the above tutorials install at least kernel 3.6, which is the first kernel to "officially" support your processor. I HIGHLY recomend upgrading the kernel to at least 3.6. If you can though, build it yourself from source.