package courier-imap 4.17.1+0.76.1-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Stickles01]

During 16.10 Ubuntu upgrade, the distribution upgrade asked if I wish to replace this file, I decided to keep as there were configuration specific parts in the old file. It failed and issued a bug report request.

ProblemType: Package
DistroRelease: Ubuntu 16.10
Package: courier-imap 4.17.1+0.76.1-3
ProcVersionSignature: Ubuntu 4.4.0-42.62-generic 4.4.21
Uname: Linux 4.4.0-42-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
Date: Thu Oct 13 22:05:23 2016
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2013-12-11 (1037 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
RelatedPackageVersions:
 dpkg 1.18.10ubuntu1
 apt 1.3.1
SourcePackage: courier
Title: package courier-imap 4.17.1+0.76.1-3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to yakkety on 2016-10-14 (0 days ago)
mtime.conffile..etc.courier.imapd: 2014-08-23T01:05:12.232146

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.