So, the short version of my sad story is that I tried upgrade Ubuntu to 12.04 and wireless driver has stopped working. I have tried all the solutions but nothing seem to be working.
When I try to install my wireless from "Additional Drivers" Its says:
Sorry, installation of this driver failed. Please have a look at the log file for details: /var/log/jockey.log
lspci command gives me the following info about wireless:
0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
I have tried removing bcm drivers and reinstalling, but nothing seems to be working.
rfkill is good too.