Phenomenon confirmed! I'm also running debian testing system, and the fresh-installed gdm3 refused to start gnome-session without any error msg here. But I haven't checked out the daemon log yet. Openbox was the only WM I used before.
Regards, Jie -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org