LightDM Display Manager 2022 Status Update: Not Much Going On
Canonical's Robert Ancell of the Ubuntu desktop team issued a status update concerning LightDM. Ancell previously managed new LightDM releases and being heavily involved in its development.
Ancell acknowledges that while Ubuntu development resources have been reduced for LightDM, the display manager continues to work but with some bit rot. Their mailing list has shutdown but they encourage discussion via GitHub and the Ubuntu Discourse. LightDM is expected to still work for other Linux distributions for those interested.
There hasn't been a new LightDM release since 2019 but those interested are encouraged to use the main Git branch. The status update can be found via Ubuntu Discourse.
Basically, not much is happening these days to LightDM for this once widely used cross-desktop display manager. Canonical understandably isn't investing much at all into it with it no longer being used by default on the Ubuntu desktop and so far no major community efforts have been trying to pick up the slack.