hostnamectl method
Since Ubuntu 16.04 (and most recent Linux distros) use Systemd you can simply use the hostnamectl command to change hostname. To see current setting, run your Terminal just type the following command:
$ hostnamectl
Sample output:
| Static hostname: lappy686 Icon name: computer-laptop Chassis: laptop Machine ID: 52ff3d3eefa19d99891c3cf4b70a138b Boot ID: fefe3aaf139855243a837001fedc7713 Operating System: Ubuntu 18.04 Kernel: Linux 4.16.0-33-generic Architecture: x86-64 |
To change hostname from lappy686 to ulng-laptop, enter:
$ hostnamectl set-hostname ulng-laptop
Type hostnamectl again to see that the hostname has updated.
Classic Method
If you don’t have such a new machine, then you can perform the following steps:
Type the following commands:
$ sudo hostname new-hostname-here
Next edit the /etc/hostname file and update hostname:
$ sudo nano /etc/hostname
Finally, edit the /etc/hosts file and update the lines that contain your old hostname:
$ sudo nano /etc/hosts
From:
127.0.1.1 old-host-name
To:
127.0.1.1 new-hostname-here
Save and close the file.