Public bug reported: This is on xubuntu 16.04 with systemd 229-4ubuntu6:
systemctl cannot reenable lightdm I have deactivated lightdm with: root@tux:~# systemctl disable lightdm root@tux:~# reboot Works as expected: lightdm does not start any more. Then I tried to reenable it with: root@tux:~# systemctl enable lightdm root@tux:~# reboot root@tux:~# systemctl reenable lightdm root@tux:~# reboot But lightdm still does not start any more! I have to start lightdm manually with: root@tux:~# systemctl start lightdm root@tux:~# systemctl is-enabled lightdm static root@tux:~# systemctl status lightdm * lightdm.service - Light Display Manager Loaded: loaded (/lib/systemd/system/lightdm.service; static; vendor preset: e Active: active (running) since Wed 2016-06-22 11:06:16 CEST; 12s ago Docs: man:lightdm(1) Process: 1803 ExecStartPre=/bin/sh -c [ "$(basename $(cat /etc/X11/default-dis Main PID: 1810 (lightdm) CGroup: /system.slice/lightdm.service |-1810 /usr/sbin/lightdm `-1822 /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm I found a workaround, after: root@tux:~# ln -s /lib/systemd/system/lightdm.service /etc/systemd/system/display-manager.service root@tux:~# reboot lightdm is starting again automatically at boot time. "systemctl enable lightdm" does not restore this link! This is the bug. root@tux:~# systemctl --version systemd 229 +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN ** Affects: systemd (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1595454 Title: systemctl cannot reenable lightdm (with workaround) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1595454/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs