Hi, I have the same problem since 3 weeks on a fresh install of Ubuntu Cosmic, with Wayland session enabled by default : 2/3 of the time, login screen doesn't appear and screen remains black, pushing power button makes Ubuntu background visible again and computer stops.
I join some Auth.log since 17th September, here is an extract - will do some further tests : Session c1 logged out. Waiting for processes to exit. Unregistered Authentication Agent for unix-session:c1 (system bus name :1.35, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale fr_FR.UTF-8) (disconnected from bus) Removed session c1. session closed for user gdm session opened for user root by (uid=1000) Executing command [USER=root] [TTY=unknown] [CWD=/home/valeryan24] [COMMAND=/usr/lib/update-notifier/package-system-locked] Operator of unix-session:2 successfully authenticated as unix-user:valeryan24 to gain TEMPORARY authorization for action org.debian.apt.install-or-remove-packages for system-bus-name::1.336 [/usr/bin/python3 /usr/bin/update-manager --no-update --no-focus-on-map] (owned by unix-user:valeryan24) asked to register item /org/freedesktop/secrets/collection/login/1, but it's already registered [system] Failed to activate service 'org.bluez': timed out (service_start_timeout=25000ms) Registered Authentication Agent for unix-session:2 (system bus name :1.190 [/usr/bin/gnome-shell], object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale fr_FR.UTF-8) New seat seat0. pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0) New session c1 of user gdm. session opened for user gdm by (uid=0) gdm-launch-environment]: pam_unix(gdm-launch-environment:session): session closed for user gdm Session c1 logged out. Waiting for processes to exit. Removed session c1. pam_unix(gdm-launch-environment:session): session opened for user gdm by (uid=0) New session c2 of user gdm. pam_systemd(gdm-launch-environment:session): Failed to create session: Start job for unit user-121.slice failed with 'canceled' session closed for user gdm session opened for user gdm by (uid=0) pam_unix(gdm-launch-environment:session): session closed for user gdm Session c2 logged out. Waiting for processes to exit. Removed session c2. systemd: pam_unix(systemd-user:session): session closed for user gdm systemd-logind[815]: Power key pressed. systemd-logind[815]: Powering Off... systemd-logind[815]: System is powering down. ** Attachment added: "Auth.log" https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1794280/+attachment/5199069/+files/Auth.log -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1794280 Title: gdm doesn't start on a fresh installation of Cosmic Desktop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1794280/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
