I can't view any wifi networks after upgrading to Ubuntu 16.04 from 14.04. This issue also occurred when trying to upgrade to Ubuntu 15.10. This is what my network window looks like:
Also there is no option for Wifi in the dropdown menu in the top right. The screenshots are from Ubuntu GNOME, but it also doesn't work for standard Ubuntu. How can I enable wifi networks?
lspci -knn | grep Net -A2:
07:00.0 Network controller : Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01) Subsystem: XAVi Technologies Corp. BCM43142 802.11b/g/n [1b9a:3002] Kernel modules: bcma, wl
sudo apt-get install bcmwl-kernel-source:
Reading package lists... Done Building dependency tree Reading state information... Done bcmwl-kernel-source is already the newest version (22.214.171.124+bdcom-0ubuntu8). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
sudo apt-get install --reinstall bcmwl-kernel-source:
Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded. Need to get 0 B/1,515 kB of archives. After this operation, 0 B of additional disk space will be used. (Reading database ... 153417 files and directories currently installed.) Preparing to unpack .../bcmwl-kernel-source_126.96.36.199+bdcom-0ubuntu8_amd64.deb ... Removing all DKMS Modules Done. Unpacking bcmwl-kernel-source (188.8.131.52+bdcom-0ubuntu8) over (184.108.40.206+bdcom-0ubuntu8) ... Setting up bcmwl-kernel-source (220.127.116.11+bdcom-0ubuntu8) ... Loading new bcmwl-18.104.22.168+bdcom DKMS files... Building only for 4.4.0-21-generic Building for architecture x86_64 Building initial module for 4.4.0-21-generic Done. wl: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/4.4.0-21-generic/updates/dkms/ depmod.... DKMS: install completed. modprobe: ERROR: could not insert 'wl': Required key not available update-initramfs: deferring update (trigger activated) Processing triggers for initramfs-tools (0.122ubuntu8) ... update-initramfs: Generating /boot/initrd.img-4.4.0-21-generic
sudo modprobe wl:
modprobe: ERROR: could not insert 'wl': Required key not available