AFAIK dpkg --configure -a will attempt to configure packages that have already been unpacked and run the postinst script:
Quote:
This script typically completes any required configuration of the package foo once foo has been unpacked from its Debian archive (".deb") file. Often, 'postinst' scripts ask the user for input, and/or warn the user that if he accepts default values, he should remember to go back and re-configure that package as the situation warrants. Many 'postinst' scripts then execute any commands necessary to start or restart a service once a new package has been installed or upgraded
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It will also update the files listed in the conffiles for the packages.
As I understand it, you will run the command and answer any questions (accepting the default where you are unsure). Depending on the number of packages involved, I guess it could take some time.
Good luck!