You lost a new Ubuntu user

[phcoder]

This access was just autmoatic package update. You can disable it but 
then you'll be unable to install new software. The idea behind ubuntu is 
to make a system for average user but with possibility of customization 
so  its default install gets you pretty much to "average user" system. 
If you want to control everything it means time to tackle around with a 
lot of options and installing every piece of software by explicitely 
saying so you can use ArchLinux or GentooLinux.
Vladimir 'phcoder' Serbinenko