Hostname is the computer name, usually displayed in user@hostname format after login. This hostname is the name you gave during the installation of the GNU/Linux i.e, the computer name. Most of us wish to change this name afterwards. Here is a simple way described to perform the action.
1. sudo nano /etc/hostname
2. Just replace the whole thing i.e, the present hostname with the new one.
3. Save the file
4. sudo nano /etc/hosts
5. Edit the second line starting with 127.0.1.1 by replacing the current hostname with the same one you entered in /etc/hostname.
6. Save the file and logout.
During the next login changes will be made.
Another important thing is about the bluetooth name visible to others during file transfer. In Ubuntu I think the default name is ‘ubuntu-0’. Don’t you feel shame to have such a bluetooth name? It is your freedom to set a name of your own. That’s the power of GNU/Linux. Don’t worry at all. GNU/Linux is also capable of changing this name too. For the change to come true,
1. cd /var/lib/bluetooth
2. There will be a directory with your bluetooth device MAC address (Most probably only that will be the only one inside this directory). Get into
3. sudo nano config
4. Substitute the perefered name adjacent to ‘name’ written as the first line.
5. Save the file.
6. Restart the bluetooth by sudo service bluetooth restart.
Now you can have that name in the bluetooth settings and accordingly as the public visible name.