Debian Linux: Change Hostname / Computer Name Permanently

To change the hostname (computer name) on a Debian Linux system permanently, you can follow these steps:

1. Open the /etc/hostname file:
   sudo nano /etc/hostname

2. Replace the existing hostname with your desired hostname. For example:
   mynewhostname

3. Save and close the file.
4. Open the /etc/hosts file:
   sudo nano /etc/hosts

5. Find the line that contains your current hostname and replace it with your new hostname. For example, if the line was:
   127.0.1.1 oldhostname


   it should now be:

   127.0.1.1 mynewhostname

6. Save and close the file.
7. Restart your system to apply the changes:
   sudo reboot


After the system restarts, you can verify that the hostname has been changed by running the following command:

The output should be your new hostname.