package proftpd-basic 1.3.4a-1 failed to install/upgrade: podproces zainstalowany skrypt pre-removal zwrócił kod błędu 100

I try to purge or remove this using dpkg.

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: proftpd-basic 1.3.4a-1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
AptOrdering:
 gadmin-proftpd: Purge
 proftpd-basic: Purge
Architecture: amd64
Date: Thu Jul 12 11:19:34 2012
ErrorMessage: podproces zainstalowany skrypt pre-removal zwrócił kod błędu 100
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: proftpd-dfsg
Title: package proftpd-basic 1.3.4a-1 failed to install/upgrade: podproces zainstalowany skrypt pre-removal zwrócił kod błędu 100
UpgradeStatus: Upgraded to precise on 2012-04-27 (75 days ago)
modified.conffile..etc.default.proftpd: [deleted]
modified.conffile..etc.init.d.proftpd: [deleted]
modified.conffile..etc.pam.d.proftpd: [deleted]
modified.conffile..etc.proftpd.blacklist.dat: [deleted]
modified.conffile..etc.proftpd.dhparams.pem: [deleted]