kazulog@sv1:~$ sudo hostnamectl set-hostname webserver
kazulog@sv1:~$ hostnamectl | head -3
 Static hostname: webserver
       Icon name: computer-vm
         Chassis: vm 🖴
kazulog@sv1:~$ hostname
webserver
kazulog@sv1:~$ cat /etc/hostname
webserver
kazulog@sv1:~$ grep 127.0 /etc/hosts
127.0.1.1 ubuntu sv1
127.0.0.1 localhost
kazulog@sv1:~$ sudo true
kazulog@sv1:~$ echo $?
0