Lightdm refusing to run after system upgrade

rollinbeaver · August 14, 2015, 02:40:22 PM

Hi,

since yesterday, i have no X11 GUI anymore after a

sudo apt-get upgrade

Because a new kernel 4.1.0 came with it, i rebooted (which i do seldomly). When the X11 login should have appeared, the screen was just slowly blinking; actually switching to graphics mode and back again. I couldn't get to a text console while this went on, but forced reboot with ctrl+alt+del worked, thankfully. On the next reboot, same story. On the third try, i set runlevel 3 in the grub linux entry and got the text consoles.
After some searching in the logs under /var/log i found the following utterances and complaints by lightdm (full logs on request):
Excerpt from auth.log: [spoiler]

Code Select


# --- auth.log ---
# normal
auth.log:Aug  9 17:13:22 laptosh lightdm: pam_unix(lightdm:session): session closed for user wolflike
auth.log:Aug  9 17:14:22 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug  9 17:14:23 laptosh systemd-logind[758]: New session c8 of user lightdm.
auth.log:Aug  9 17:14:23 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug  9 17:16:22 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug  9 17:16:22 laptosh systemd-logind[808]: New session c3 of user lightdm.
auth.log:Aug  9 17:16:22 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug  9 17:19:24 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug  9 17:19:24 laptosh lightdm: pam_unix(lightdm:session): session opened for user wolflike by (uid=0)
auth.log:Aug  9 17:19:24 laptosh lightdm: pam_ck_connector(lightdm:session): nox11 mode, ignoring PAM_TTY :0
auth.log:Aug  9 17:40:29 laptosh lightdm: pam_unix(lightdm:session): session closed for user wolflike
auth.log:Aug  9 17:40:32 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
auth.log:Aug  9 17:40:34 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug  9 17:40:34 laptosh systemd-logind[808]: New session c4 of user lightdm.
auth.log:Aug  9 17:40:34 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug  9 17:40:58 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug  9 17:40:58 laptosh lightdm: pam_unix(lightdm:session): session opened for user wolflike by (uid=0)
auth.log:Aug  9 17:40:58 laptosh lightdm: pam_ck_connector(lightdm:session): nox11 mode, ignoring PAM_TTY :0
auth.log:Aug  9 22:48:50 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug  9 22:48:50 laptosh systemd-logind[789]: New session c3 of user lightdm.
auth.log:Aug  9 22:48:50 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug  9 22:49:18 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug  9 22:49:18 laptosh lightdm: pam_unix(lightdm:session): session opened for user wolflike by (uid=0)
auth.log:Aug  9 22:49:19 laptosh lightdm: pam_ck_connector(lightdm:session): nox11 mode, ignoring PAM_TTY :0
# after upgrade
auth.log:Aug 13 17:19:39 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:39 laptosh systemd-logind[856]: New session c3 of user lightdm.
auth.log:Aug 13 17:19:39 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:39 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 17:19:40 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
auth.log:Aug 13 17:19:42 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:42 laptosh systemd-logind[856]: New session c4 of user lightdm.
auth.log:Aug 13 17:19:42 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:42 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 17:19:43 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
auth.log:Aug 13 17:19:45 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:45 laptosh systemd-logind[856]: New session c5 of user lightdm.
auth.log:Aug 13 17:19:45 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:45 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 17:19:45 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
auth.log:Aug 13 17:19:48 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:48 laptosh systemd-logind[856]: New session c6 of user lightdm.
auth.log:Aug 13 17:19:48 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:48 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 17:19:48 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
auth.log:Aug 13 17:19:51 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:51 laptosh systemd-logind[856]: New session c7 of user lightdm.
auth.log:Aug 13 17:19:51 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:51 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 17:19:51 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
auth.log:Aug 13 17:19:53 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:53 laptosh systemd-logind[856]: New session c8 of user lightdm.
auth.log:Aug 13 17:19:53 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 17:19:54 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 17:19:54 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
...
# forced reboot
# manual try from runlevel 3
auth.log:Aug 13 22:22:11 laptosh sudo: wolflike : TTY=tty1 ; PWD=/home/wolflike ; USER=root ; COMMAND=/usr/sbin/service lightdm start
auth.log:Aug 13 22:22:15 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 22:22:15 laptosh systemd-logind[747]: New session c3 of user lightdm.
auth.log:Aug 13 22:22:15 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 22:22:16 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 22:22:16 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
auth.log:Aug 13 22:22:19 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 22:22:19 laptosh systemd-logind[747]: New session c4 of user lightdm.
auth.log:Aug 13 22:22:19 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 22:22:19 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 22:22:19 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
auth.log:Aug 13 22:22:22 laptosh lightdm: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 22:22:22 laptosh systemd-logind[747]: New session c5 of user lightdm.
auth.log:Aug 13 22:22:22 laptosh systemd: pam_unix(systemd-user:session): session opened for user lightdm by (uid=0)
auth.log:Aug 13 22:22:22 laptosh lightdm: pam_unix(lightdm-greeter:session): session closed for user lightdm
auth.log:Aug 13 22:22:22 laptosh systemd: pam_unix(systemd-user:session): session closed for user lightdm
...
# forced reboot

[/spoiler]
Excerpt from daemon.log: [spoiler]

Code Select


# --- daemon.log ---
# normal
daemon.log:Aug  9 17:14:23 laptosh systemd[1]: Started Session c8 of user lightdm.
daemon.log:Aug  9 17:14:23 laptosh systemd[1]: Starting Session c8 of user lightdm.
daemon.log:Aug  9 17:16:22 laptosh systemd[1]: Started Session c3 of user lightdm.
daemon.log:Aug  9 17:16:22 laptosh systemd[1]: Starting Session c3 of user lightdm.
daemon.log:Aug  9 17:40:34 laptosh systemd[1]: Started Session c4 of user lightdm.
daemon.log:Aug  9 17:40:34 laptosh systemd[1]: Starting Session c4 of user lightdm.
daemon.log:Aug  9 22:28:45 laptosh systemd[1]: Stopping Session c4 of user lightdm.
daemon.log:Aug  9 22:48:50 laptosh systemd[1]: Started Session c3 of user lightdm.
daemon.log:Aug  9 22:48:50 laptosh systemd[1]: Starting Session c3 of user lightdm.
# after upgrade
Aug 13 17:19:39 laptosh systemd[1]: Started Session c3 of user lightdm.
Aug 13 17:19:39 laptosh lightdm[886]: ** (lightdm:886): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
Aug 13 17:19:41 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
Aug 13 17:19:41 laptosh systemd[1]: lightdm.service: Unit entered failed state.
Aug 13 17:19:41 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
Aug 13 17:19:41 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
Aug 13 17:19:42 laptosh systemd[1]: Started Session c4 of user lightdm.
Aug 13 17:19:43 laptosh lightdm[1704]: ** (lightdm:1704): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
Aug 13 17:19:44 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
Aug 13 17:19:44 laptosh systemd[1]: lightdm.service: Unit entered failed state.
Aug 13 17:19:44 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
Aug 13 17:19:44 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
Aug 13 17:19:45 laptosh systemd[1]: Started Session c5 of user lightdm.
Aug 13 17:19:45 laptosh lightdm[1743]: ** (lightdm:1743): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
Aug 13 17:19:47 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
Aug 13 17:19:47 laptosh systemd[1]: lightdm.service: Unit entered failed state.
Aug 13 17:19:47 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
Aug 13 17:19:47 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
Aug 13 17:19:48 laptosh systemd[1]: Started Session c6 of user lightdm.
Aug 13 17:19:48 laptosh lightdm[1783]: ** (lightdm:1783): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
Aug 13 17:19:49 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
Aug 13 17:19:49 laptosh systemd[1]: lightdm.service: Unit entered failed state.
Aug 13 17:19:49 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
Aug 13 17:19:49 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
Aug 13 17:19:51 laptosh systemd[1]: Started Session c7 of user lightdm.
Aug 13 17:19:51 laptosh lightdm[1824]: ** (lightdm:1824): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
Aug 13 17:19:52 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
Aug 13 17:19:52 laptosh systemd[1]: lightdm.service: Unit entered failed state.
Aug 13 17:19:52 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
Aug 13 17:19:52 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
Aug 13 17:19:53 laptosh systemd[1]: Started Session c8 of user lightdm.
Aug 13 17:19:54 laptosh lightdm[1861]: ** (lightdm:1861): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
Aug 13 17:19:55 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
Aug 13 17:19:55 laptosh systemd[1]: lightdm.service: Unit entered failed state.
Aug 13 17:19:55 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
...
# forced reboot
# manual try from runlevel 3
daemon.log:Aug 13 22:22:13 laptosh lightdm[4042]: ** (lightdm:4042): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
daemon.log:Aug 13 22:22:15 laptosh systemd[1]: Started Session c3 of user lightdm.
daemon.log:Aug 13 22:22:16 laptosh lightdm[4042]: ** (lightdm:4042): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
daemon.log:Aug 13 22:22:18 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
daemon.log:Aug 13 22:22:18 laptosh systemd[1]: lightdm.service: Unit entered failed state.
daemon.log:Aug 13 22:22:18 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
daemon.log:Aug 13 22:22:18 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
daemon.log:Aug 13 22:22:19 laptosh systemd[1]: Started Session c4 of user lightdm.
daemon.log:Aug 13 22:22:19 laptosh lightdm[4104]: ** (lightdm:4104): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
daemon.log:Aug 13 22:22:20 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
daemon.log:Aug 13 22:22:20 laptosh systemd[1]: lightdm.service: Unit entered failed state.
daemon.log:Aug 13 22:22:20 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
daemon.log:Aug 13 22:22:21 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
daemon.log:Aug 13 22:22:22 laptosh systemd[1]: Started Session c5 of user lightdm.
daemon.log:Aug 13 22:22:22 laptosh lightdm[4144]: ** (lightdm:4144): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
...
# forced reboot

[/spoiler]
Excerpt from syslog: [spoiler]

Code Select


# --- syslog ---
# normal
syslog:Aug  9 17:14:23 laptosh systemd[1]: Started Session c8 of user lightdm.
syslog:Aug  9 17:14:23 laptosh systemd[1]: Starting Session c8 of user lightdm.
syslog:Aug  9 17:16:22 laptosh systemd[1]: Started Session c3 of user lightdm.
syslog:Aug  9 17:16:22 laptosh systemd[1]: Starting Session c3 of user lightdm.
syslog:Aug  9 17:40:34 laptosh systemd[1]: Started Session c4 of user lightdm.
syslog:Aug  9 17:40:34 laptosh systemd[1]: Starting Session c4 of user lightdm.
syslog:Aug  9 22:28:45 laptosh systemd[1]: Stopping Session c4 of user lightdm.
syslog:Aug  9 22:48:50 laptosh systemd[1]: Started Session c3 of user lightdm.
syslog:Aug  9 22:48:50 laptosh systemd[1]: Starting Session c3 of user lightdm.
syslog:Aug  9 22:49:14 laptosh lightdm: pam_ecryptfs: Passphrase file wrapped
# after upgrade
syslog:Aug 13 17:19:39 laptosh systemd[1]: Started Session c3 of user lightdm.
syslog:Aug 13 17:19:39 laptosh lightdm[886]: ** (lightdm:886): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 17:19:41 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
syslog:Aug 13 17:19:41 laptosh systemd[1]: lightdm.service: Unit entered failed state.
syslog:Aug 13 17:19:41 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
syslog:Aug 13 17:19:41 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
syslog:Aug 13 17:19:42 laptosh systemd[1]: Started Session c4 of user lightdm.
syslog:Aug 13 17:19:43 laptosh lightdm[1704]: ** (lightdm:1704): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 17:19:44 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
syslog:Aug 13 17:19:44 laptosh systemd[1]: lightdm.service: Unit entered failed state.
syslog:Aug 13 17:19:44 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
syslog:Aug 13 17:19:44 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
syslog:Aug 13 17:19:45 laptosh systemd[1]: Started Session c5 of user lightdm.
syslog:Aug 13 17:19:45 laptosh lightdm[1743]: ** (lightdm:1743): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 17:19:47 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
syslog:Aug 13 17:19:47 laptosh systemd[1]: lightdm.service: Unit entered failed state.
syslog:Aug 13 17:19:47 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
syslog:Aug 13 17:19:47 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
syslog:Aug 13 17:19:48 laptosh systemd[1]: Started Session c6 of user lightdm.
syslog:Aug 13 17:19:48 laptosh lightdm[1783]: ** (lightdm:1783): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 17:19:49 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
syslog:Aug 13 17:19:49 laptosh systemd[1]: lightdm.service: Unit entered failed state.
syslog:Aug 13 17:19:49 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
syslog:Aug 13 17:19:49 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
syslog:Aug 13 17:19:51 laptosh systemd[1]: Started Session c7 of user lightdm.
syslog:Aug 13 17:19:51 laptosh lightdm[1824]: ** (lightdm:1824): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 17:19:52 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
syslog:Aug 13 17:19:52 laptosh systemd[1]: lightdm.service: Unit entered failed state.
syslog:Aug 13 17:19:52 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
syslog:Aug 13 17:19:52 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
syslog:Aug 13 17:19:53 laptosh systemd[1]: Started Session c8 of user lightdm.
syslog:Aug 13 17:19:54 laptosh lightdm[1861]: ** (lightdm:1861): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 17:19:55 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
syslog:Aug 13 17:19:55 laptosh systemd[1]: lightdm.service: Unit entered failed state.
syslog:Aug 13 17:19:55 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
...
# forced reboot
# manual try from runlevel 3
syslog:Aug 13 22:22:13 laptosh lightdm[4042]: ** (lightdm:4042): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 22:22:15 laptosh systemd[1]: Started Session c3 of user lightdm.
syslog:Aug 13 22:22:16 laptosh lightdm[4042]: ** (lightdm:4042): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 22:22:18 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
syslog:Aug 13 22:22:18 laptosh systemd[1]: lightdm.service: Unit entered failed state.
syslog:Aug 13 22:22:18 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
syslog:Aug 13 22:22:18 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
syslog:Aug 13 22:22:19 laptosh systemd[1]: Started Session c4 of user lightdm.
syslog:Aug 13 22:22:19 laptosh lightdm[4104]: ** (lightdm:4104): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
syslog:Aug 13 22:22:20 laptosh systemd[1]: lightdm.service: Main process exited, code=exited, status=1/FAILURE
syslog:Aug 13 22:22:20 laptosh systemd[1]: lightdm.service: Unit entered failed state.
syslog:Aug 13 22:22:20 laptosh systemd[1]: lightdm.service: Failed with result 'exit-code'.
syslog:Aug 13 22:22:21 laptosh systemd[1]: lightdm.service: Service hold-off time over, scheduling restart.
syslog:Aug 13 22:22:22 laptosh systemd[1]: Started Session c5 of user lightdm.
syslog:Aug 13 22:22:22 laptosh lightdm[4144]: ** (lightdm:4144): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed
...
# forced reboot

[/spoiler]

The only real error here appears to be

Code Select

(lightdm:4144): CRITICAL **: session_get_login1_session_id: assertion 'session != NULL' failed, which i don't understand.

Yes, lightdm* was upgraded, too; but i tried again with a downgrade to the previous versions, to no avail.
Any ideas?
--
Regards,
-- rollinbeaver, stopped in my tracks...

rollinbeaver · August 14, 2015, 03:36:44 PM

Hi,

the problem remains, but i struggled free by sidestepping it: i defected from lightdm to lxdm from the repositories.

So, avoided for now, but as yet unsolved.
--
Regards,
-- rollinbeaver, rollin' again