To permanently change an Ubuntu 20.04 Server’s name edit the /etc/hostname file:

sudo vim /etc/hostname

This will show the current server (host) name:

Rename Ubuntu 20.04 Server:

Change the name to whatever you want to call the server:

Save the changes (esc :wq in vim).

You will see that the hose still has its old name:

Reboot the server to update its name to the new name.

Now the server has its new name:

This change is now permanent.

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