Am Dienstag 03 Juli 2018 schrieb Thierry de Coulon:
Debian Stretch here. Same thing happened with tha last update/upgrade
Obviously Debian/Devuan got updated too and reset the display manager. As far as I am concerned it's not a bug, just an result of the distribution not respecting modifications by the user and going back to some config file it used for it's own setup.
I my case I found myself loging in from Gnome again.
Thierry
Thank you. Stefan