I'm having the same issue. My laptop is Dell XPS 13 (9343) with Ubuntu
16.04 and a kernel version 4.4.0-31. lshw -c network would give me the
output "*-network UNCLAIMED".
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bcmwl driver does not work with kernel 4.4.0-21 when secure boot
Status in bcmwl package in Ubuntu:
After updating ubuntu 16.04 to latest kernel 4.4.0-21, bcmwl driver
(package bcmwl-kernel-source) does not load and wifi not work.
sudo modprobe wl
modprobe: ERROR: could not insert 'wl': Required key not available
If I boot with kernel 4.4.0-18 - bcmwl loads normally and wifi works.
If secure boot disabled - bcmwl loads normally with kernel 4.4.0-21
and wifi works.
DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2015-12-02 (140 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
Package: bcmwl-kernel-source 220.127.116.11+bdcom-0ubuntu8
ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
Uname: Linux 4.4.0-18-generic x86_64
UpgradeStatus: Upgraded to xenial on 2016-03-03 (47 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
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