I have Ubuntu 12.4LTS
I find that the Internet works well when hard wired, but not through my WiFi.
I have tried additional hardware and update manager and everything up to date.
The F3 button doesn't work, and none of my laptops hard keys above the keyboard work (including WiFi, obviously, amoung, mail, bluetooth and saturn)
I found a forum where I enabled WiFi through a terminal session but it disconnected me from the hard wired connection, and for the first time the WiFi signal came up. It showed it was searching (flashing up to down) and searching for approx 30 seconds then it disappeared and turned the hard wired internet back on.
So, a glimmer of hope. To me it feels like Ubuntu is turning on WiFi, but the computer doesn't have it running.
Help please! P.S I can't find anywhere in the BIOS where I can play with networking settings. Someone will have to walk me through that if you think that's the problem.