Ok, voilà le résultat de la commande indiquée dans le message de moko138 et je redémarre comme indiqué.
jalal@jalal-GA-78LMT-S2:~$ sudo chown -Rc $USER:$USER /home/$USER
[sudo] password for jalal:
changed ownership of '/home/jalal/Downloads/hl3150cdwcupswrapper-1.1.4-0a.i386.deb' from root:root to jalal:jalal
changed ownership of '/home/jalal/Downloads/uninstaller_HL3150CDW' from root:root to jalal:jalal
changed ownership of '/home/jalal/Downloads/hl3150cdwlpr-1.1.2-1a.i386.deb' from root:root to jalal:jalal
changed ownership of '/home/jalal/Downloads/hl3150cdwlpr-1.1.2-1.i386.deb' from root:root to jalal:jalal
changed ownership of '/home/jalal/Downloads/uninstaller_' from root:root to jalal:jalal
changed ownership of '/home/jalal/Downloads/hl3150cdwcupswrapper-1.1.4-0.i386.deb' from root:root to jalal:jalal
changed ownership of '/home/jalal/.dbus/session-bus/8157c953e2194c3999660530396c0303-0' from root:root to jalal:jalal
changed ownership of '/home/jalal/.dbus/session-bus' from root:root to jalal:jalal
changed ownership of '/home/jalal/.dbus' from root:root to jalal:jalal
