When sshing onto my fave droplet...
27 packages can be updated. 14 updates are security updates. *** System restart required ***
To reboot a server from the command line, run:
sudo shutdown -r now
That ^^ is the preferred method, over the more obvious:
Many Unix systems have reboot perform an instant reboot — no syncing, no umounting, nothing. It's just like hitting the reset button
Though someone counters with....
Judging from the manual pages of both reboot and shutdown, it looks like shutdown provides a bit more lower-level functionality, and reboot is a higher-level tool that uses shutdown.