Upgrade to 16.04 breaks Wifi on Dell XPS 13 (9343)

Question

Ubuntu 15.x was working great on my Dell XPS 13. After upgrading to 16.04 it appears the drivers for the Broadcom BCM4352 Wireless Network Adapter are not loaded.

lshw -C network says the network is UNCLAIMED

There are now entries in the modprobe.d blacklisted file for Broadcom.

Any help is appreciated.

P.S. I dual boot to Win10. The network is fine there.

Solution 1

Disabling secure boot in the BIOS solved the problem for me. (found answer on dell forums: http://en.community.dell.com/support-forums/laptop/f/3518/t/19683197)

Solution 2

It was working on 16.04 until Kernel 4.4.0-21. I don't really want to disable secure boot, so am hoping for a fix. If applicable, please mark the bug as affecting you, then it might receive some attention. The Ubuntu bug is: https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1572659