package maas-dhcp 1.7.6+bzr3376-0ubuntu2~15.04.1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 100

[Mike McCracken]

package failed to install during do-release-upgrade from vivid to wily

happened immediately after https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1485089

ProblemType: Package
DistroRelease: Ubuntu 15.10
Package: maas-dhcp 1.7.6+bzr3376-0ubuntu2~15.04.1
ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
Uname: Linux 3.19.0-21-generic x86_64
ApportVersion: 2.18-0ubuntu6
Architecture: amd64
Date: Fri Aug 14 12:11:32 2015
DuplicateSignature: package:maas-dhcp:1.7.6+bzr3376-0ubuntu2~15.04.1:subprocess new pre-removal script returned error exit status 100
ErrorMessage: subprocess new pre-removal script returned error exit status 100
InstallationDate: Installed on 2014-04-15 (485 days ago)
InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.18.2ubuntu1
 apt 1.0.9.10ubuntu1
SourcePackage: maas
Title: package maas-dhcp 1.7.6+bzr3376-0ubuntu2~15.04.1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 100
UpgradeStatus: Upgraded to wily on 2015-08-14 (0 days ago)