is it possible to tell aptitude to show older versions of a package next
to the currently available one if it is still present in
/var/cache/apt/archives? Like it does when you use unstable and
experimental side by side? I know that aptitude does not really support
downgrades of packages, but showing those packages directly in aptitude
if available in the cache is a lot easier than searching them in the
file system and installing them manually, especially if you don't know
where they hide.