Hi, Since a couple of days I need root permission to poweroff. It seems that there is a second user logged into the machine. $ who peter :0 2014-03-10 19:04 (:0) peter pts/0 2014-03-16 11:36 (:0) $ users peter peter I don' t know hwat caused it, perhaps by shh from another machine. What can I do to get rid of this problem. Peter