I'm running a relatively new Dell XPS with 14.04 LTS. Everything had been working fine and I've done several updates. Last night I used the Software Updater and installed a number of updates, after which I could not connect to any wifi networks.
When I run ifconfig, it returns only lo and eth1. Previously, it would also have returned wlan0.
I've also run:
$ lspci -nn | grep 0280
Which returns:
3a:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
I can connect via ethernet, but really need to get the wifi up and running again.
This answers seems to suggest an offline solution: Install Intel AC 8260 wireless drivers offline
But I'm wondering if there is a more efficient solution while I'm connected via ethernet?
EDIT/UPDATE:
Per @Pilot6 request, I'm adding the output of dkms status
below:
btusb-iwlwifi-intel8260, 1.7, 3.19.0-33-generic, x86_64: installed
btusb-iwlwifi-intel8260, 1.7, 3.19.0-64-generic, x86_64: installed
btusb-iwlwifi-intel8260, 1.7, 3.19.0-65-generic, x86_64: installed
intel-hid, 2.0, 3.19.0-33-generic, x86_64: installed
intel-hid, 2.0, 3.19.0-64-generic, x86_64: installed
intel-hid, 2.0, 3.19.0-65-generic, x86_64: installed
oem-audio-hda-daily-lts-vivid, 0.201512022217~ubuntu14.04.1, 3.19.0-33-generic, x86_64: installed
oem-audio-hda-daily-lts-vivid, 0.201512022217~ubuntu14.04.1, 3.19.0-64-generic, x86_64: installed
oem-audio-hda-daily-lts-vivid, 0.201512022217~ubuntu14.04.1, 3.19.0-65-generic, x86_64: installed
realtek-rts-cr, 1.4.3oem2, 3.19.0-33-generic, x86_64: installed
realtek-rts-cr, 1.4.3oem2, 3.19.0-64-generic, x86_64: installed
realtek-rts-cr, 1.4.3oem2, 3.19.0-65-generic, x86_64: installed
synaptic-i2c-hid-3.13.0-32-backport, 1.6.4: added
sudo modprobe iwlwifi
If you get "Required key not available" then @Pilot6 is quite correct. Disable Secure Boot.sudo modprobe iwlwifi
ismodprobe: ERROR: could not insert 'iwlwifi': Required key not available
- sorry - meant to add that I'm about to try the suggestion...dkms status
terminal command.