How to change hostname in ubuntu 20.04?

@lonzo 

To change the hostname in Ubuntu 20.04, follow these steps:

1. Open a terminal window.
2. Use the hostnamectl command to set the hostname. For example, to set the hostname to "new-hostname", use the following command:

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sudo hostnamectl set-hostname new-hostname

1. Edit the /etc/hosts file to reflect the new hostname. Open the file using your preferred text editor, such as nano or vi.

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sudo nano /etc/hosts

1. Locate the line that begins with 127.0.1.1 and replace the hostname after the 127.0.1.1 with the new hostname. For example:

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127.0.1.1 new-hostname

1. Save the changes to the /etc/hosts file and exit the text editor.
2. Reboot the system for the changes to take effect.

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sudo reboot

After the system reboots, the hostname will be changed to the new value. You can verify the new hostname by running the hostname command.

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hostname

@lonzo 

This command will display the current hostname of the system.