~$ sudo apt update; apt full-upgrade
Hit:1 http://security.ubuntu.com/ubuntu xenial-security InRelease
Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease             
Hit:3 http://us.archive.ubuntu.com/ubuntu xenial InRelease               
Hit:4 http://dl.google.com/linux/chrome/deb stable Release              
Hit:5 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease      
Hit:7 https://deb.opera.com/opera-stable stable InRelease
Reading package lists... Done
Building dependency tree       
Reading state information... Done
2 packages can be upgraded. Run 'apt list --upgradable' to see them.
E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?