标题没看懂是正常的， 我写的全是关键字。

装12.04后， 无线网卡网速超级慢。 Google后发现解决方法：

If the output of:

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lspci -k | grep  brcmsmac

includes:

1

Kernel driver in use: brcmsmac

Then you have this problem too.

To solve this, you’ll need to install broadcom-sta driver and blacklist the default kernel one.

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sudo apt-get install bcmwl-kernel-source

Then open /etc/modprobe.d/blacklist-bcm43.conf and add these lines:

1
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blacklist brcmsmac
blacklist bcma

Restart and check that:

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lspci -k | grep  wl

includes:

1

Kernel driver in use: wl

That should fix your wifi.
Hope ubuntu devs fix this and push out updates soon.