How to rebuild package database

["Hans-J. Ullrich" <hans.ullrich@loop.de>]

Hi all, 

accidently I crashed my package database with 

dpkg --set-selections < packagelist.txt

Now aptitude wants to delete a lot and reinstall other packages, which are 
already installed. 

I want to correct my database to the already installed package. There is 
another file with the list of the already installed packages available, which 
was created by synaptic.

How can I teach aptitude, to read this file and let it generate an up-to-date 
database ?


Thanks for any help !

best regards 

Hans