I had a similar issue. This error in syslog finally lead me to my
solution:
(EE) systemd-logind: failed to get session: PID 10023 does not belong to
any known session
As a result of that error, gdm-x-session fails further along in the gdm3
start up process and aborts:
/usr/lib/gdm3/gdm-x-session[2849]: dbus-daemon[3479]: [session uid=136
pid=3479] Activating service name='org.freedesktop.systemd1' requested by
':1.0' (uid=136 pid=2849 comm="/usr/lib/gdm3/gdm-x-session gnome-session
--autost" label="unconfined")
/usr/lib/gdm3/gdm-x-session[2849]: dbus-daemon[3479]: [session uid=136
pid=3479] Activated service 'org.freedesktop.systemd1' failed: Process
org.freedesktop.systemd1 exited with status 1
gdm-x-session: could not fetch environment:
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
org.freedesktop.systemd1 exited with status 1
gdm3: GdmManager: trying to register new display
gdm3: GdmManager: Error while retrieving session id for sender: Error getting
session id from systemd: No data available
gdm-x-session: Could not register display:
GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: No display available
The gdm3 service just keeps trying to start gdm-x-session over and over again,
flooding syslog.
I fixed it by adding this line to /etc/pam.d/gdm-launch-environment:
session optional pam_systemd.so
My theory on the real problem is that pam-auth-update is run during some
package installs and it would have added pam_systemd to /etc/pam.d
/common-session. However, I had done manual edits to at least one
/etc/pam.d/common-* file, in which case pam-auth-update aborts if "--
force" is not specified.
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https://bugs.launchpad.net/bugs/1773386
Title:
Returned to login screen immediately after login
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