To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.

mediaserver@MediaServer:~$ sudo apt update && sudo apt update
[sudo] password for mediaserver: 
Hit:1 http://no.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://no.archive.ubuntu.com/ubuntu xenial-updates InRelease             
Hit:3 http://no.archive.ubuntu.com/ubuntu xenial-backports InRelease           
Get:4 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]     
Fetched 102 kB in 0s (150 kB/s)                              
Reading package lists... Done
Building dependency tree       
Reading state information... Done
84 packages can be upgraded. Run 'apt list --upgradable' to see them.
Hit:1 http://no.archive.ubuntu.com/ubuntu xenial InRelease
Hit:2 http://no.archive.ubuntu.com/ubuntu xenial-updates InRelease             
Hit:3 http://no.archive.ubuntu.com/ubuntu xenial-backports InRelease           
Get:4 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]     
Fetched 102 kB in 0s (146 kB/s)                              
Reading package lists... Done
Building dependency tree       
Reading state information... Done
84 packages can be upgraded. Run 'apt list --upgradable' to see them.
mediaserver@MediaServer:~$ y
y: command not found
mediaserver@MediaServer:~$ Y
Y: command not found
mediaserver@MediaServer:~$