It appears that hal is the culprit after all: after stopping the dbus service completely using /etc/init.d/dbus stop, the problem has gone away. This means that this report is probably not for autofs but for the hal package, and it could confirm bug 55223.
-- Unmounting of automounted filesystems fails with SIGUSR1 https://launchpad.net/bugs/63720 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
