This article covers some approaches to restart the Ubuntu system (Linux OS) like restarting Ubuntu using shutdown command, reboot command, init command, and systemd way. In fact, Every operating system needs to reboot or restart after some time due to various reasons. Some of the reasons are that certain software needs a reboot after installation to become fully functional, due to some configurational change, or maybe because of a software glitch. 

This article will guide you on the different methods through which you can effectively reboot your #Ubuntu 20.04 system without any difficulty. 

To #reboot immediately, append the -r flag: $ sudo shutdown -r now. 

To power down immediately: $ sudo shutdown -P now. 

You can use the poweroff #command: $ poweroff. 

To reboot after 10 minutes: $ sudo shutdown -r 10.

To reboot Linux using the command line:

1. To reboot the Linux system from a terminal session, sign in or "su"/"sudo" to the "root" account.

2. Then type " sudo reboot " to reboot the box.

3. Wait for some time and the Linux server will reboot itself.