This bug was fixed in the package lightdm - 1.4.0-0ubuntu5
--------------- lightdm (1.4.0-0ubuntu5) raring; urgency=low
* Add 11_runtime_dir_access.patch: Allow guest session to write /run/user/<username>/. (LP: #1131139) -- Martin Pitt <email address hidden> Mon, 25 Feb 2013 14:44:18 +0100
This bug was fixed in the package lightdm - 1.4.0-0ubuntu5
---------------
lightdm (1.4.0-0ubuntu5) raring; urgency=low
* Add 11_runtime_ dir_access. patch: Allow guest session to write user/<username> /. (LP: #1131139)
/run/
-- Martin Pitt <email address hidden> Mon, 25 Feb 2013 14:44:18 +0100