This will show all the versions of the package in the cache
apt-cache show [package name] | fgrep Version:

This will install an older version of the package
apt-get install [package name]=[version]

I recently did an upgrade using apt-get update / upgrade and one of the packages didn't fair so well so I needed to roll it back.

Rollback to previous package version after upgrade with Ubuntu 8.04LTS and apt

ubuntu

Other