package maas-region-controller 1.7.1+bzr3341-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Happened during sudo apt-get dist-upgrade.

ProblemType: Package
DistroRelease: Ubuntu 15.04
Package: maas-region-controller 1.7.1+bzr3341-0ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
Uname: Linux 3.19.0-9-generic x86_64
ApportVersion: 2.16.2-0ubuntu4
Architecture: amd64
Date: Tue Mar 24 22:35:22 2015
DuplicateSignature: package:maas-region-controller:1.7.1+bzr3341-0ubuntu2:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2013-03-02 (752 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.17.24ubuntu1
 apt 1.0.9.7ubuntu3
SourcePackage: maas
Title: package maas-region-controller 1.7.1+bzr3341-0ubuntu2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to vivid on 2014-11-16 (128 days ago)