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I updated my 12.04 today and it broke my wireless connection on Acer Aspire 5942G.

isa@ubuntu: iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

isa@ubuntu: lspci|grep Network
03:00.0 Network controller:Broadcom Corporation BCM43225 802.11b/g/n (rev 01)

Can someone help me please?

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Plug into ethernet and run the following commands:

sudo apt-get install linux-firmware-nonfree
sudo apt-get install linux-headers-generic
sudo apt-get install bcmwl-kernel-source
sudo modprobe -r b43 ssb wl
sudo modprobe wl

After a few seconds wireless activated and detected my newtork. (The above commands were run by using wired network of course)

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You might try this:

sudo gedit /etc/modprobe.d/cfg80211.conf

Add one line:

options cfg80211 ieee80211_regdom=UK

Proofread, save and close gedit. Unload and reload brcmsmac:

sudo modprobe -r brcmsmac
sudo modprobe brcmsmac


sudo cat /var/log/syslog | grep cfg | tail -n20
cat /sys/module/cfg80211/parameters/ieee80211_regdom

It may take a reboot.

Source: Ubuntu Forums: BCM43225 and limitation UK/Europe Channels 12/13

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