tom@cincuenta:~$ sudo dpkg --configure dbus-system-bus-common Setting up dbus-system-bus-common (1.16.2-1) ... fatal: The user `messagebus' already exists, but is not a system user. Exiting. dpkg: error processing package dbus-system-bus-common (--configure): installed dbus-system-bus-common package post-installation script subprocess returned error exit status Errors were encountered while processing: dbus-system-bus-common tom@cincuenta:~$ grep messagebus /etc/passwd /etc/group /etc/passwd:messagebus:x:103:109::/nonexistent:/usr/sbin/nologin /etc/group:messagebus:x:109: tom@cincuenta:~$ dpkg -l adduser Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-==============-============-============-================================= ii adduser 3.143 all add and remove users and groups