I'm sorry I couldn't ... I tried to run with 'sudo', and back to the pronpt. I tried with 'sudo su', and back to the pronpt. I tried '/ usr / sbin / rcxdm start', and: === AUTHENTICATION FOR org.freedesktop.systemctl.manager-units === Authentication as: root Password: === AUTHENTICATION COMPLETE === I try again, and it doesn't work, I start on the display-manager ... I try again, and everything repeats itself.