6.4.14 Verify installed package files

debsums enables verification of installed package files against MD5 checksums. Some packages do not have available MD5 checksums. A possible temporary fix for sysadmins:

     # cat >>/etc/apt/apt.conf.d/90debsums
     DPkg::Post-Install-Pkgs {"xargs /usr/bin/debsums -sg";};
     ^D

per Joerg Wendland [email protected] (untested).