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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.

Ubuntu has a page dedicated to helping users with broadcom WIFI adapters.

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You need to remove the incorrect driver:

sudo apt-get purge bcmwl-kernel-source

Reboot and let us hear your report

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  • after removing and reboot, no wireless connection is was showing. I had to reinstall it again. – Saroj Santra Sep 15 '14 at 12:38
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This link fixed my issue. The problem was with router security option.

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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.

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