Instructions on changing your host name
Open the hostname file
and switch your desired host name on the place of the old host name
Open the hosts file
And replace your old hostname with your new one.
Restart services which might be affected by this change. This will cut any connections like SSH, although they should reconnect. We recommend just restarting the whole machine in order to make sure you restarted all affected services.
invoke-rc.d hostname.sh start invoke-rc.d networking force-reload invoke-rc.d network-manager force-reload
Or more simply, Just reboot.
Other operating systems: