Apparently, I've had VirtualBox guest utilities installed on my host system which you are generally just supposed to run on the guest. This issue only occurred when the package was updated. After trial and error, I've found that the offending package is virtualbox-guest-x11:amd64 (5.1.34-dfsg-0ubuntu1.16.04.2), none of the other virtualbox-guest packages cause this problem.
** Summary changed: - LightDM and GDM fail to start after systemd update in VirtualBox guest + LightDM and GDM fail to start after update in virtualbox-guest-x11 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1760371 Title: LightDM and GDM fail to start after update in virtualbox-guest-x11 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1760371/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
