How to Set or Change Hostname on Ubuntu 26.04

To set or change the hostname on Ubuntu 26.04, use hostnamectl and update /etc/hosts.

Step 1 : Show the current hostname.

hostname

Step 2 : Set a new name.

sudo hostnamectl set-hostname server-01

Step 3 : Confirm the file.

cat /etc/hostname

Step 4 : Update /etc/hosts.

sudo sed -i 's/^127\.0\.1\.1.*/127.0.1.1\tserver-01/' /etc/hosts

Step 5 : Reboot.

sudo reboot

You have set or changed the hostname on Ubuntu 26.04.