If the system were to be rebooted at this point, the login console would show up on
tty0, which is the normal console when a monitor and keyboard are connected. There might, however, be a case where the connected monitor is not immediately compatible or where for some reason the USB keyboard or monitor cannot be used. The serial console has served us very well until now, and thus, in order to enable it on this, the Debian or Ubuntu installation is strongly recommended. Here, the first difference between Debian and Ubuntu, however, becomes apparent. Debian still uses the older
sysvinit, whereas Ubuntu still uses
upstart, and while both are slowly in the progress of migrating to
systemd, this is not applicable at this moment. ...