user@user-SATELLITE-C50-A-19U:~$  sudo nautilus /etc/default/grub 
[sudo] password for user: 
user
Riprovare.
[sudo] password for user: 

(nautilus:4967): Gtk-WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files