[Bug 1725609] Re: no wifi after upgrading to 17.10

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1725609

Title:
  no wifi after upgrading to 17.10

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  Overview
  ========
  After upgrading Xubuntu 17.04 to 17.10, wifi stopped working completely

  Expected behaviour
  ==================
  Wifi should continue to work after an OS upgrade

  Actual behaviour
  ================
  Wifi not available, no driver loaded

  Analysis
  ========
  System reports wifi as Broadcom Limited BCM4352 802.11ac Wireless Network Adapter (rev 03), in Additional Drivers, Linux STA driver from bcmwl-kernel-source is shown as selected

  Attempting to reconfigure bcmwl-kernel-source gives an error:
  geoff at monster:~$ sudo dpkg-reconfigure bcmwl-kernel-source 
  Removing all DKMS Modules
  Done.
  Loading new bcmwl-6.30.223.271+bdcom DKMS files...
  Building for 4.13.0-16-lowlatency
  Building for architecture x86_64
  Module build for kernel 4.13.0-16-lowlatency was skipped since the
  kernel headers for this kernel does not seem to be installed.
  modprobe: FATAL: Module wl not found in directory /lib/modules/4.13.0-16-lowlatency
  update-initramfs: deferring update (trigger activated)
  Processing triggers for initramfs-tools (0.125ubuntu12) ...
  update-initramfs: Generating /boot/initrd.img-4.13.0-16-lowlatency
  cryptsetup: WARNING: target cryptswap1 has a random key, skipped
  Processing triggers for shim-signed (1.32+0.9+1474479173.6c180c6-1ubuntu1) ...
  Secure Boot not enabled on this system.

  Looks like the upgrade didn't install the kernel headers which meant
  no WIFI on reboot

  Workaround
  ==========
  Installing the appropriate kernel headers and reconfiguring bcmwl-kernel-source fixed my system immediately

  Connect wired Ethernet then:
  sudo apt-get install linux-headers-$(uname -r)
  sudo dpkg-reconfigure bcmwl-kernel-source

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.7
  ProcVersionSignature: Ubuntu 4.13.0-16.19-lowlatency 4.13.4
  Uname: Linux 4.13.0-16-lowlatency x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Sat Oct 21 19:53:58 2017
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-23 (1123 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2017-10-21 (0 days ago)
  VarLogDistupgradeTermlog:

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