I can confirm this bug. I'm running an up-to-date Dapper install on i386. The problem is that gconfd takes around 10 seconds to exit once the Gnome session has ended. This means that the files used by gconfd in the user's SMB-mounted home directory are still in use when pam_mount goes to unmount the share so unmounting fails. As far as I can tell, pam_mount has no ability to retry later meaning that the share is never unmounted.
** Changed in: gconf2 (Ubuntu) Status: Needs Info => Confirmed -- The gconf daemon takes upto one minute to exit https://launchpad.net/bugs/45002 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs