Improvement: Simply add 2 lines to /etc/gdm/PostSession/Default and do
_not_ store a backup of Default in the PostSession directory.

$ ls /etc/gdm/PostSession/
Default

$ tail /etc/gdm/PostSession/Default 
  done
  IFS=$OLD_IFS 
  echo "$OUTPUT"
}

# the following 2 lines were added by toobuntu on 080828:
kill -9 $( ps U "${USER}" | grep -v TTY | mawk '{print $1}' ) 2> 
/tmp/kill-stragglers-gdm.errors
/etc/init.d/gdm restart

exit 0

-----
FYI- From http://www.gnome.org/projects/gdm/docs/2.14/configuration.html :

When the user terminates his session, the PostSession script will be
run. Again operation is similar to Init, PostLogin  and PreSession.
Again the script will be run with root privileges, the slave daemon will
block and the $USER environment variable will contain the name of the
user who just logged out and $DISPLAY will be set to the display the
user used, however note that the X server for this display may already
be dead and so you shouldn't try to access it. Also $X_SERVERS
environmental variable is set and this points to a fake generated X
servers file for use with the sessreg accounting application.

Note that the PostSession script will be run even when the display fails
to respond due to an I/O error or similar. Thus, there is no guarantee
that X applications will work during script execution.

-- 
Processes remain after log off
https://bugs.launchpad.net/bugs/236210
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