I'm using a Lenovo 100S Chromebook and I'm using a fresh install of Ubuntu 16.04 (Unity). I'm having a problem where I basically have no permissions for anything. Software Center, Software Updater. I managed to get permissions for Software Center by using:

sudo software-center

This allowed me to download Software Boutique, but when I try to install through that, I don't have permissions. I have looked everywhere and have not found a clear solution for this (although I am new to Ubuntu so maybe I just didn't understand what I read).

Also worth noting that if I use

sudo update-manager

Software update will work, but it does only through the terminal.

EDIT: When I try to install via Software Center, I get a window that says:

AUTHENTICATION ERROR Software can't be installed or removed because the authentication service is not available. (org.freedesktop.PolicyKit.Error.Failed: ('system-bus-name', {'name': ':1.91'}): org.debian.apt.install-or-remove-packages

When I hit OK I get another window that says

You don't have the required permissions to perform this action

and under details it says