** Changed in: unity-greeter (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1303725
Title:
Unable to log in if user has invalid session configured and no session
switcher shown
Status in “unity-greeter” package in Ubuntu:
Fix Committed
Bug description:
I was having some unrelated problems with unity, so I temporarily removed it
which caused me to stumble across this problem.
I have gnome also installed on my system, and was planning to use it in the
meanwhile. After I removed unity and reboot my computer, I noticed the session
selector disappeared. From the ubuntu wiki I found this information:
The session switcher will only show up if you have more than one VALID
session; a valid session is one that points to a valid executable.
This would be fine, except for lightdm assumed that the one session
available was 'ubuntu.' I could not change the session because the
selector was missing. Every attempt to log in would begin to appear
as if it worked, but then I would just be stuck looking at the
background image and nothing else.
I looked though the logs and found these lines in x-0-greeter.log
[+0.03s] DEBUG: Connected version=1.8.5 default-session=ubuntu
show-manual-login=false hide-users=false has-guest-account=true
show-remote-login=true
...
[+0.09s] DEBUG: Ignoring session /usr/share/xsessions/ubuntu.desktop
[+0.09s] DEBUG: Loaded session /usr/share/xsessions/gnome.desktop (GNOME,
This session logs you into GNOME)
...
[+1.79s] DEBUG: Authentication complete for user jonathan with return code 0
[+1.79s] DEBUG: Starting session ubuntu
So I changed the default session from 'ubuntu' to 'gnome', by running the
following command:
sudo /usr/lib/lightdm/lightdm-set-defaults --session gnome
(I also verified in /etc/lightdm/lightdm.conf that it worked)
This time around the log showed that default-session=gnome, but still
attempted to load 'ubuntu' regardless. The only way I was ever able to
get into gnome was by making a copy of gnome.desktop in
/usr/share/xsessions, renaming the copy to ubuntu.desktop, forcing the
session switcher to reappear. It worked, but it's a little bit
hackish.
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