Type the following command to edit /etc/hostname using nano or vi text editor:
sudo nano /etc/hostname
Delete the old name and setup new name.
Next Edit the /etc/hosts file:
sudo nano /etc/hosts
Replace any occurrence of the existing computer name with your new one.
Reboot the system to changes take effect:
sudo reboot
references:
https://www.cyberciti.biz/faq/ubuntu-change-hostname-command/
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