So I have 12.04 on a HP Pavilion g series laptop.
12.04 works fine on my computer.
Then several weeks ago, my laptop would no longer connect to the internet. My tablet connects fine. I booted ubuntu on my USB and it works fine. Something seems to be wrong "within" Ubuntu.
I have now reinstalled ubuntu 4 times. After varying amounts of time the same problem reoccurs (and I have stopped updating any software in case this is the problem).
I use Cisco Anyconnect and Real VNC to log into a server somewhere else (they are the only programs I could imagine causing any problems).