Ubuntu : Change Computer hostname

Not necessarily, but you may like to change your computer host name, may be just to sync all host names on your domain. Here you can do it as:

1. Launch a terminal window
2. open the hostname  file under /etc
     ~$ gksudo gedit /etc/hostname
3. Enter admin pwd on prompt
4. Change the existing host name, save the file and exit.
5. Restart your machine to reflect the new host name.