libpam0g & libpam-modules fail integrity check with debsums

$ lsb_release -rd
Description: Ubuntu 11.04
Release: 11.04

$ apt-cache policy libpam0g libpam-modules
libpam0g:
  Installed: 1.1.2-2ubuntu8
  Candidate: 1.1.2-2ubuntu8
  Version table:
 *** 1.1.2-2ubuntu8 0
        500 http://us.archive.ubuntu.com/ubuntu/ natty/main amd64 Packages
        100 /var/lib/dpkg/status
libpam-modules:
  Installed: 1.1.2-2ubuntu8
  Candidate: 1.1.2-2ubuntu8
  Version table:
 *** 1.1.2-2ubuntu8 0
        500 http://us.archive.ubuntu.com/ubuntu/ natty/main amd64 Packages
        100 /var/lib/dpkg/status

The libpam0g and libpam-modules packages fail validation with debsums. The packages are validated as follows:

$ sudo debsums -a libpam0g libpam-modules | fgrep FAILED
/lib/x86_64-linux-gnu/libpam.so.0.82.3 FAILED
/lib/x86_64-linux-gnu/libpam_misc.so.0.82.0 FAILED
/lib/x86_64-linux-gnu/libpamc.so.0.82.1 FAILED
/usr/share/doc/libpam0g/changelog.Debian.gz FAILED
/lib/x86_64-linux-gnu/security/pam_access.so FAILED
/lib/x86_64-linux-gnu/security/pam_debug.so FAILED
/lib/x86_64-linux-gnu/security/pam_deny.so FAILED
/lib/x86_64-linux-gnu/security/pam_echo.so FAILED
/lib/x86_64-linux-gnu/security/pam_env.so FAILED
/lib/x86_64-linux-gnu/security/pam_exec.so FAILED
/lib/x86_64-linux-gnu/security/pam_faildelay.so FAILED
/lib/x86_64-linux-gnu/security/pam_filter.so FAILED
/lib/x86_64-linux-gnu/security/pam_ftp.so FAILED
/lib/x86_64-linux-gnu/security/pam_group.so FAILED
/lib/x86_64-linux-gnu/security/pam_issue.so FAILED
/lib/x86_64-linux-gnu/security/pam_keyinit.so FAILED
/lib/x86_64-linux-gnu/security/pam_lastlog.so FAILED
/lib/x86_64-linux-gnu/security/pam_limits.so FAILED
/lib/x86_64-linux-gnu/security/pam_listfile.so FAILED
/lib/x86_64-linux-gnu/security/pam_localuser.so FAILED
/lib/x86_64-linux-gnu/security/pam_loginuid.so FAILED
/lib/x86_64-linux-gnu/security/pam_mail.so FAILED
/lib/x86_64-linux-gnu/security/pam_mkhomedir.so FAILED
/lib/x86_64-linux-gnu/security/pam_motd.so FAILED
/lib/x86_64-linux-gnu/security/pam_namespace.so FAILED
/lib/x86_64-linux-gnu/security/pam_nologin.so FAILED
/lib/x86_64-linux-gnu/security/pam_permit.so FAILED
/lib/x86_64-linux-gnu/security/pam_pwhistory.so FAILED
/lib/x86_64-linux-gnu/security/pam_rhosts.so FAILED
/lib/x86_64-linux-gnu/security/pam_rootok.so FAILED
/lib/x86_64-linux-gnu/security/pam_securetty.so FAILED
/lib/x86_64-linux-gnu/security/pam_selinux.so FAILED
/lib/x86_64-linux-gnu/security/pam_sepermit.so FAILED
/lib/x86_64-linux-gnu/security/pam_shells.so FAILED
/lib/x86_64-linux-gnu/security/pam_stress.so FAILED
/lib/x86_64-linux-gnu/security/pam_succeed_if.so FAILED
/lib/x86_64-linux-gnu/security/pam_tally.so FAILED
/lib/x86_64-linux-gnu/security/pam_tally2.so FAILED
/lib/x86_64-linux-gnu/security/pam_time.so FAILED
/lib/x86_64-linux-gnu/security/pam_timestamp.so FAILED
/lib/x86_64-linux-gnu/security/pam_umask.so FAILED
/lib/x86_64-linux-gnu/security/pam_unix.so FAILED
/lib/x86_64-linux-gnu/security/pam_userdb.so FAILED
/lib/x86_64-linux-gnu/security/pam_warn.so FAILED
/lib/x86_64-linux-gnu/security/pam_wheel.so FAILED
/lib/x86_64-linux-gnu/security/pam_xauth.so FAILED
/usr/share/doc/libpam-modules/changelog.Debian.gz FAILED

The packages continue to fail validation even after being reinstalled with "sudo aptitude reinstall libpam0g libpam-modules" and rechecked. The likeliest reason for the failure is invalid MD5 sums included in the deb files; because of the critical security nature of these files, ensuring the accuracy of the MD5 sums being shipped with the packages is essential.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: libpam-modules 1.1.2-2ubuntu8
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Mon May 2 17:28:37 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pam
UpgradeStatus: No upgrade log present (probably fresh install)