For the moment I performed:
apt-cache policy libpam-modules
which provided data about which old versions are available on my system. So that I could run
apt-get install libpam-modules=1.1.1-2ubuntu2
rolling back from 1.1.1-2ubuntu5.2 to 1.1.1-2ubuntu2
in my case on the Lucid System.
For the moment I performed:
apt-cache policy libpam-modules
which provided data about which old versions are available on my system.
So that I could run
apt-get install libpam- modules= 1.1.1-2ubuntu2
rolling back from 1.1.1-2ubuntu5.2 to 1.1.1-2ubuntu2
in my case on the Lucid System.