When the login screen does finally come up (without Wayland support), the first log message is:
Feb 24 15:25:39 kab gnome-shell[1013]: JS ERROR: Gio.IOErrorEnum: Error calling StartServiceByName for org.gnome.SessionManager: Timeout was reached _injectToMethod/klass[method]@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:290:25 _makeProxyWrapper/<@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:267:17 SessionManager@resource:///org/gnome/shell/misc/gnomeSession.js:36:12 _init@resource:///org/gnome/shell/misc/systemActions.js:140:25 getDefault@resource:///org/gnome/shell/misc/systemActions.js:28:22 _init@resource:///org/gnome/shell/ui/status/system.js:18:31 _init@resource:///org/gnome/shell/ui/panel.js:743:24 _ensureIndicator@resource:///org/gnome/shell/ui/panel.js:1070:25 _updateBox@resource:///org/gnome/shell/ui/panel.js:1081:34 _updatePanel@resource:///org/gnome/shell/ui/panel.js:1027:14 _init@resource:///org/gnome/shell/ui/panel.js:836:14 _initializeUI@resource:///org/gnome/shell/ui/main.js:221:13 start@resource:///org/gnome/shell/ui/main.js:162:5 @<main>:1:47 Feb 24 15:25:39 kab gnome-shell[1013]: Execution of main.js threw exception: Script <main> threw an exception -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1916701 Title: [glib2.0 2.67.4-1] Black screen on boot, login screen missing/delayed, eventually comes up without Wayland support (only Xorg sessions offered) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/glib2.0/+bug/1916701/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs