I don't know why this thread was WRONGLY moved to "Any Other OS" section, since I'm now using Ubuntu 14.04.
Apart from this, there's nothing more I can try? no more help?
Broadcom related issues (and in particular with bcm4312 lp-phy) are still widely experienced on Ubuntu and it seems there's no more interest in fixing those faulty drivers.
It's really diappointing.
If anyone is having the same problems as me, here is how correctly configure ndiswrapper to make the wireless connection work:
http://ubuntuforums.org/showthread.php?t=1410259
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