Update notifier not requesting root privileges

[AG <computing.account@googlemail.com>]

Hello

After having a recent fresh installation, I've noticed that the update 
notifier no longer seeks root privileges before downloading/ installing 
software packages.

This is not a big concern as I am the only user.  However, I do like the 
reassurance of having to deliberately do things as root, so I would like 
it to not proceed without root permissions.

How do I set it up, so that the root password is asked for automatically?

I am using Squeeze  (freshly squeezed as of May 30th).

Thanks

AG