User without privileges was able to update via apper without being asked root's password.
I've the following problem.
When I launch df command being a usual user of machine it outputs what I need:
But when I try to launch it from another user (www-data in this case) I have problems with permissions:
I understand that this is because user www-data doesn't have enough privileges.
I have a MySQL installed on my linux server, I forgot it's password so I went and changed it using the methods I found on the web.