The leatest Ubuntu has a serious security bug caused by pulseaudio. If you configure pammount to mount a crypted home directory it is not able to unmount it because pulseaudio has files in use (.pulse/*). You can not even kill the daemon because it is set to user session. So, how can you stop the pulseaudio user session? In the hope that this releases the files. Is it really necessary for the deamon to lock the files that you can not unmount or is this a bug?