Ubuntu's new policy dictates that updates to already installed applications don't require password when doing it from Update Manager (Synaptic and apt-get still require password). Also, I would like to prevent the Update Manager to pop-up, it should only run when I invoke it. Thanks.
To remove the 'update packages without admin auth'
The section in question is this
Probably the easiest & maybe best solution is to just remove the whole section.
If desired you could leave & try setting the ResultActive=yes to this
If I wanted this I'd just remove the section, then the action should fallback to the default in /usr/share/polkit-1/actions/org.debian.apt.policy which is to require auth per use.