Where does the update manager log distribution upgrades?

[Adam Funk]

On 2007-06-11, NoOp wrote:

>> I just upgraded from edgy to feisty using the update-manager.  Where
>> (if anywhere) will it have logged the package changes?  (I want to
>> find out the version number that I was previously running for a
>> particular package.)

> Synaptic:
>
> System|Administration|Synaptic Package Manager|File|History

Yes, thanks!  

Incidentally, do you know where the data files are, and whether they
are in a greppable text format?