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Hostname is stored in /etc/hostname file on Debian. This file is read at the boot time and  name is setup using the init script /etc/init.d/hostname.sh

To make changes to the hostname, first edit this file as follows:

#sudo gedit /etc/hostname

Once you’re done editing the hostname, save the file  and run the following command to set the hostname.

#sudo /etc/init.d/hostname.sh start

Now, check and confirm your hostname.