I installed ubuntu 14. I'm having unstable wireless Internet connection with my BCM4312 card. It's connected and after few seconds it's gone.
Please have a look at the wireless script. What can I do to get a stable connection?
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According to your pastebin you need to install the firmware files for your wireless adapter.
[ 36.601067] b43-phy0 ERROR: Firmware file "b43/ucode15.fw" not found [ 36.601073] b43-phy0 ERROR: Firmware file "b43-open/ucode15.fw" not found [ 36.601075] b43-phy0 ERROR: You must go to http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the correct firmware for this driver version. Please carefully read all instructions on this website.
This link fixed my issue. The problem was with router security option.
I had a similar problem (as analyzed in @h0twir3 answer) with the broadcom b43xx firmware.
Simply installing the open source b43 driver (source) with :
apt-get install firmware-b43-installer
solved my missing firmware problem.