ok, from one of the earlier posts: Enter 'help' for a list of built-in commands. /home/user # apt-get remove healthcheck ?? apt-get autoremove Reading package lists... Done Building dependency tree Reading state information... Done E: Regex compilation error - Invalid preceding regular expression /home/user # /home/user # apt-get install healthcheck Reading package lists... Done Building dependency tree Reading state information... Done healthcheck is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 8 not upgraded. /home/user #