Ubuntu/Debian - How can I find out the versions of packages that were installed on the system before the last update?

Question

linux

Updated packages on the server:
apt-get upgrade
The following packages will be upgraded:
List of upgraded packages...
69 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.
OS: Debian GNU/Linux 6.0.9 (squeeze)
Questions:
Is it possible to find out the previous versions of the packages that were in the system before the last update?
Is it possible to rollback to previous versions of packages?

Answer 1

Update history:
/var/log/apt/history.log
You can roll back if the previous version remains in the repository (this is not always the case)
How automatically - I don’t know.
The rollback of the desired version is done
But it's better, probably, by hand through aptitude to resolve all dependencies.

Answer 2

I recommend that you install etckeeper. This application commits changes in the /etc directory through the version control system. I have git selected.
In debian did not check his work. In fedora, when installing via the yum package manager, etckeeper is launched, which makes commits, then in the git log by commits, you can see what was removed / installed and when. An example of a fragment of such a log:
pastebin.com/ZZHN5PCM