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% sudo systemctl enable lightdm --force % ls -l /etc/systemd/system/display-manager.service lrwxrwxrwx. 1 root root 35 Sep 1 15:17 /etc/systemd/system/display-manager.service -> /usr/lib/systemd/system/gdm.service This used to work and would change the link to lightdm. Both gdm and lightdm service files have a Alias=display-manager.service
*** This bug has been marked as a duplicate of bug 1374371 ***