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I have some problems with one deb package installed on my ubuntu server. I want to make sure that the files that are installed in my system from that package are the same as they are in a deb file.

What is the easiest to to check if the installed deb package has no changes from the original files and if there are some change to see the diff?

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Debsums: http://manpages.ubuntu.com/manpages/oneiric/man1/debsums.1.html

debsums - check the MD5 sums of installed Debian packages

Verify installed Debian package files against MD5 checksum lists from /var/lib/dpkg/info/*.md5sums.

debsums can generate checksum lists from deb archives for packages that don't include one.

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