Comment 0 for bug 1769969

After upgrading my office machines to 18.04, some machines did not start the GDM3.

After some testing the problem was that the ones that it did not work, had SDDM installed too (KDE environment in those machines).

The upgrade were from 17.10 and 16.04.

Note that reistalling sddm, gdm3, lightdm, dpkg-reconfigure gdm3, none worked.

On gdm3 side: systemctl is-active gdm3 reports static (which might be the problem).

After removing sddm and rebooting, everything worked as expected.