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 Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1794280 Title: gdm doesn't start on a fresh installation of Cosmic Desktop Status in gdm3 package in Ubuntu: Won't Fix Status in kmod package in Ubuntu: Invalid Status in linux package in Ubuntu: Invalid Status in xorg-server package in Ubuntu: Confirmed Status in xserver-xorg-video-fbdev package in Ubuntu: Fix Released Status in gdm3 source package in Cosmic: Won't Fix Status in kmod source package in Cosmic: Invalid Status in linux source package in Cosmic: Invalid Status in xorg-server source package in Cosmic: Confirmed Status in xserver-xorg-video-fbdev source package in Cosmic: Fix Released Bug description: ubuntu cosmic desktop 20180925 After installation gdm fails to start and there is only a black screen with a blinking cursor on the top left of the screen. gdm3 can be started manually from a tty When this issue happens there is a plymouth crash reported in bug 1794292 ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: gdm3 3.30.0-0ubuntu2 ProcVersionSignature: Ubuntu 4.18.0-7.8-generic 4.18.5 Uname: Linux 4.18.0-7-generic x86_64 ApportVersion: 2.20.10-0ubuntu11 Architecture: amd64 Date: Tue Sep 25 13:54:45 2018 InstallationDate: Installed on 2018-09-25 (0 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180925) ProcEnviron: TERM=linux PATH=(custom, no user) LANG=fr_FR.UTF-8 SHELL=/bin/bash SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install) mtime.conffile..etc.gdm3.custom.conf: 2018-09-25T13:49:41.053012 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1794280/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
