Linux Shout published three ways to change the hostname on Ubuntu 20.04 LTS Focal Fossa Linux.

3 Ways to Change Hostname on Ubuntu 20.04 LTS Focal Fossa Linux

If you are using Ubuntu 20.04 LTS Focal Fossa, then here are the commands and GUI method to change the HOSTNAME or device name.

3 Ways to Change Hostname on Ubuntu 20.04 LTS Focal Fossa Linux