This update fixes the following issues with lightdm:
- update to version 1.8.8
+ Handle signals being received in child processes instead of treating them like they are received in the daemon
+ bnc#846832, lp#1260220: Ensure X authority is written before X server is started
+ Honour session type requested by greeter for guest sessions
+ Fix some small memory leaks detected by valgrind
+ Fix double removal of source IDs
+ Correctly invoke PAM to change authentication token
+ Fix issue where VTs are double used when switching sessions
+ Don't pass system user accounts from AccountsService to greeters
+ Fix crash if switching to greeter and it isn't installed
+ Implement missing guest-wrapper functionality and enable it for Ubuntu
+ Update AppArmor scripts to work in Ubuntu 13.10
+ Correctly set for greeters. This was regressed in 1.7.5 for ConsoleKit and was never passed to logind
+ Correctly set user in session setup script
+ Fix notification of sessions being logged out
+ Fix crash when starting with existing X servers
+ Fix crash where Process objects are accessed after unref