package cherrytree 0.36.4-1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1

[Sandip Bandyopadhyay]

I can't remove cherrytree from the repository.

ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: cherrytree 0.36.4-1
ProcVersionSignature: Ubuntu 4.4.0-38.57-generic 4.4.19
Uname: Linux 4.4.0-38-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
AptOrdering:
 cherrytree: Remove
 python-lockfile: Configure
 duplicity: Configure
 variety: Configure
 NULL: ConfigurePending
Architecture: amd64
Date: Sat Oct 1 13:34:43 2016
ErrorMessage: subprocess installed pre-removal script returned error exit status 1
InstallationDate: Installed on 2016-08-25 (37 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.4ubuntu1.1
 apt 1.2.12~ubuntu16.04.1
SourcePackage: cherrytree
Title: package cherrytree 0.36.4-1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)