package privoxy 3.0.21-2 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1

Unknown problem. It happened during a 13.10 -> 14.04 upgrade.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: privoxy 3.0.21-2
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Wed Apr 30 17:21:22 2014
DuplicateSignature: package:privoxy:3.0.21-2:ErrorMessage: subprocess installed post-installation script returned error exit status 1
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2013-03-22 (404 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
SourcePackage: privoxy
Title: package privoxy 3.0.21-2 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to trusty on 2014-04-30 (0 days ago)
modified.conffile..etc.privoxy.config: [modified]
modified.conffile..etc.privoxy.user.action: [modified]
mtime.conffile..etc.privoxy.config: 2013-10-22T14:56:25.956352
mtime.conffile..etc.privoxy.user.action: 2014-01-09T11:26:20