Change the "device name" in the details window of System settings

Execute the following command using a terminal:

sudo sed -i 's/present-host-name/new-host-name/' /etc/hosts
sudo sed -i 's/present-host-name/new-host-name/' /etc/hostname

You can check your present-host-name by cat /etc/hostname or hostname.

Then reboot the computer, to see the changes.

Then change the line

127.0.1.1   victor-System-Product-Name

with

 127.0.1.1    your-desired-name

Then also open the file /etc/hostname with command gksu gedit /etc/hostname and change the hostname there to reflect the new name.
Then reboot the computer, to see the changes

Since there are plenty of ways to get something done here is one more:

While in your root directory:

cd /etc
sudo vi hostname

Type in your admin password, press Enter.

Press i to 'insert' and change existing device name to the desired device name.

Press Esc and type :wq!, press Enter.

Restart the system for the change to take affect.

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