Jul 09

Lost wireless after upgrading a Lenovo Ideapad U160 to Ubuntu 12.04

Category: Linux   — Published by goeszen on July 9, 2012 at 6:42 pm

If you end up with no wlan after upgrading your Ideapad to Ubuntu to 12.04 Precise, then you are victim of a rare case: Ubuntu switched the wlan driver to an open source one for the b43 series of wireless card, like the Broadcom BMC4313 with PCI id 14e4:4727 that is used in the Ideapad U160.
But also, this firmware isn't free, so it isn't installed with the upgrade, leaving wlan in a non functional state.

To get wireless back, do this

sudo apt-get remove --purge bcmwl-kernel-source
sudo rm /etc/modprobe.d/blacklist-bcm43.conf

which deinstalls Broadcom STA related stuff that might have been installed before. Then make sure that the broadcom drivers aren't blacklisted in /etc/modprobe.d/blacklist.conf (look for things with "43" in the name, or "br cm")

and after that:

sudo apt-get install linux-firmware-nonfree
sudo reboot

And your wireless should be up after the next reboot!

If this doesn't help, try your luck with the STA proprietary driver. (Which is the reverse of what we did above):

sudo jockey-gtk
Select the STA driver

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