How to force a re-install from deb repository after local package screw-up?

Hi,

I mistakenly screwed up my tex-live installation on lenny, by trying to locally install some squeeze packages.

I've got a list of packages that are in state 'pU', and I'd like to replace them all by the a clean known to be working repository version.

How do I do that?

From serverfault jeje

• apt-get --reinstall install mypackage
  

  Option --reinstall will tell apt-get to install the given package, even if it believes that the same version is already installed.

  From sleske