package vsftpd 3.0.2-14ubuntu1 failed to install/upgrade: subproces installed post-removal script gaf een foutwaarde 1 terug

installed vsftpd, but the deamon did not start. Found out I had already installed pure-ftpd. So in uninstalled that first, then wanted to deinstall vsftpd and reinstall again.
pure-ftpd is deinstalled now, but I can't remove, purge or reconfigure (dpkg) vsftpd anymore.

ProblemType: Package
DistroRelease: Ubuntu 14.10
Package: vsftpd 3.0.2-14ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-30.40-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.1
AptOrdering: vsftpd: Remove
Architecture: amd64
Date: Tue Feb 10 10:12:51 2015
DpkgTerminalLog:
 Removing vsftpd (3.0.2-14ubuntu1) ...
 vsftpd stop/waiting
 dpkg: error processing package vsftpd (--remove):
  subproces installed post-removal script gaf een foutwaarde 1 terug
DuplicateSignature: package:vsftpd:3.0.2-14ubuntu1:subproces installed post-removal script gaf een foutwaarde 1 terug
ErrorMessage: subproces installed post-removal script gaf een foutwaarde 1 terug
InstallationDate: Installed on 2014-08-07 (186 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: vsftpd
Title: package vsftpd 3.0.2-14ubuntu1 failed to install/upgrade: subproces installed post-removal script gaf een foutwaarde 1 terug
UpgradeStatus: No upgrade log present (probably fresh install)