With Kernel 4.4.0-78-generic WLAN is not available anymore. Didn't make it to reinstall older Kernel again yet.
System:
ThinkPad T420
Ubuntu-Mate 16.04 LTS
---
ApportVersion: 2.20.1-0ubuntu2.6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: sascha 2035 F.... pulseaudio
CurrentDesktop: MATE
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=4a78d02c-6d4a-47dc-90b1-d47fe6575c58
InstallationDate: Installed on 2016-09-28 (257 days ago)
InstallationMedia: Ubuntu-MATE 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: LENOVO 4180W1A
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-78-generic.efi.signed root=/dev/mapper/ubuntu--mate--vg-root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.4.0-78.99-generic 4.4.62
RelatedPackageVersions:
linux-restricted-modules-4.4.0-78-generic N/A
linux-backports-modules-4.4.0-78-generic N/A
linux-firmware N/A
Tags: xenial
Uname: Linux 4.4.0-78-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip disk kvm libvirtd lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 02/08/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 83ET74WW (1.44 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4180W1A
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr83ET74WW(1.44):bd02/08/2013:svnLENOVO:pn4180W1A:pvrThinkPadT420:rvnLENOVO:rn4180W1A:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4180W1A
dmi.product.version: ThinkPad T420
dmi.sys.vendor: LENOVO
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1697265
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.