I get the same bug. Attached is a 'diff', (based on Bob Tanner's previous post), that seems to fix it.
HTH...
--- /tmp/base-config.postinst.old 2005-08-19 01:29:43.000000000 -0400 +++ /var/lib/dpkg/info/base-config.postinst 2005-08-19 01:29:51.000000000 -0400 @@ -54,7 +54,7 @@ apt-setup/non-free apt-setup/contrib apt-setup/badsource \ apt-setup/another apt-setup/badedit \ apt-setup/security-updates \ - apt-setup/security-updates-failed \ + apt-setup/security-updates-failed do db_fset $q seen false || true done
