Public bug reported:
Steps to reproduce:
- Have Ubuntu installed.
- Install lightdm. This makes lightdm the active window manager, as far as I
can remember.
- Uninstall lightdm.
- Reboot.
Expected result:
- System booting another available window manager (gdm3 in this case).
- At very least an error message about something being broken (might belong to
another package).
Actual result:
- System boots, but doesn't proceed up to visible graphics -> blank,
black screen.
Diagnosis:
- One can still switch to a text console using Ctrl-Alt-F1..F4
- /etc contains a broken link (took me 2 full days to find that):
$ ls -l /etc/systemd/system/display-manager.service
... /etc/systemd/system/display-manager.service ->
/lib/systemd/system/lightdm.service
Manual fix:
$ cd /etc/systemd/system
$ sudo ln -sf /lib/systemd/system/gdm3.service display-manager.service
Suggested fix:
- lightdm making another window manager active on uninstallation, just like it
becomes the active manager on installation.
- Printing a big ERROR message if there is no other window manager installed.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lightdm (not installed)
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon May 11 22:18:02 2020
InstallationDate: Installed on 2016-05-04 (1468 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: lightdm
UpgradeStatus: Upgraded to focal on 2020-05-03 (7 days ago)
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1878095
Title:
Uninstallation leads to broken system
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