[Bug 1884665] [NEW] lightdm not starting after fresh install

[magicsux]

Public bug reported:

Full Bash History after fresh Ubuntu 18 install:
$ sudo apt install tasksel
$ sudo tasksel install ubuntu-mate-core
$ sudo service lightdm start

facing the problem that lightdm isn't starting at all.

Things I've tried:
* sudo dpkg-reconfigure lightdm
- no changes
* journalctl -u lightdm.service
- outputting:
systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: lightdm.service: Failed with result 'exit-code'.
systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 1.
systemd[1]: Stopped Light Display Manager.
systemd[1]: Starting Light Display Manager...
lightdm[24112]: Seat type 'xlocal' is deprecated, use 'type=local' instead
systemd[1]: Started Light Display Manager.
lightdm[24112]: Error: can't open /lib/modules/4.19.56-x86_64-jb1/updates/dkms
* sudo apt --fix-broken install

Hopefully we can fix that problem somehow

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lightdm 1.26.0-0ubuntu1
Uname: Linux 4.19.56-x86_64-jb1 x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
Date: Tue Jun 23 00:07:58 2020
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: tasksel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

** Also affects: tasksel (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1884665

Title:
  lightdm not starting after fresh install

Status in lightdm package in Ubuntu:
  New
Status in tasksel package in Ubuntu:
  New

Bug description:
  Full Bash History after fresh Ubuntu 18 install:
  $ sudo apt install tasksel
  $ sudo tasksel install ubuntu-mate-core
  $ sudo service lightdm start

  facing the problem that lightdm isn't starting at all.

  Things I've tried:
  * sudo dpkg-reconfigure lightdm
  - no changes
  * journalctl -u lightdm.service
  - outputting:
  systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
  systemd[1]: lightdm.service: Failed with result 'exit-code'.
  systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
  systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 1.
  systemd[1]: Stopped Light Display Manager.
  systemd[1]: Starting Light Display Manager...
  lightdm[24112]: Seat type 'xlocal' is deprecated, use 'type=local' instead
  systemd[1]: Started Light Display Manager.
  lightdm[24112]: Error: can't open /lib/modules/4.19.56-x86_64-jb1/updates/dkms
  * sudo apt --fix-broken install

  Hopefully we can fix that problem somehow

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: lightdm 1.26.0-0ubuntu1
  Uname: Linux 4.19.56-x86_64-jb1 x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  Date: Tue Jun 23 00:07:58 2020
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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