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root@Junkbox-AMD-Athlon-2-x3-450:/etc# sudo systemctl enable lightdm

Synchronizing state of lightdm.service with SysV init with /lib/systemd/systemd-sysv-install...

Executing /lib/systemd/systemd-sysv-install enable lightdm

The unit files have no [Install] section. They are not meant to be enabled

using systemctl.

Possible reasons for having this kind of units are:

1) A unit may be statically enabled by being symlinked from another unit's

   .wants/ or .requires/ directory.

2) A unit's purpose may be to act as a helper for some other unit which has

   a requirement dependency on it.

3) A unit may be started when needed via activation (socket, path, timer,

   D-Bus, udev, scripted systemctl call, ...).