Change hostname in Ubuntu or Debian

If you’ve changed your mind about your Linux hostname or you’ve set to wrong hostname, here is how to fix it.

Firstly, I’ve tried the following command:

$sudo hostname mybrandnewname

But this will revert back to prior hostname whenever the machine reboots. So how can you change it permanently? First you’ll need to edit /etc/hostname file

$sudo vi /etc/hostname Then delete the old name and type whatevername you desire

It is also advisable to change new hostname in /etc/hosts file

Source : UbuntuManual

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