Setting the root password

You can also use the su command to switch to the root user but first, you need to set the root's password:

root@ubuntu-linux:~# passwd 
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

Amazing, now exit the root user:

root@ubuntu-linux:~# exit 
logout
elliot@ubuntu-linux:~$ whoami 
elliot

Now you can use the su root command to switch to the root user:

elliot@ubuntu-linux:~$ su root 
Password:
root@ubuntu-linux:/home/elliot# whoami 
root