After an update session it is not always possible to do the restart immediately.
Therefore Linux has an option to time the restart on a 24h clock bases.
On Ubuntu the command looks like:
sudo shutdown 23:00 -r
The two option that can be used are:
|-h||actually halt system, ready for power off|
|-r||shutdown and automatically perform a re-boot|
Usually “-r” is the preferred one for remote servers in combination with the “screen” command.