The package with that command was missing, so I installed it. I don't know if that could be the cause. Loggin out after the command "gdm- signal --reboot" the system rebooted.
-- after kernel update, reboot button in window "reboot needed" doesn't reboot https://bugs.launchpad.net/bugs/320654 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs