package python-twisted-core 13.0.0-1ubuntu1 failed to install/upgrade: ErrorMessage: symbolic link '/usr/lib/python2.7/dist-packages/twisted/trial/_dist/workercommands.py' size has changed from 70 to 0

Automated crash report in do-release-upgrade

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: python-twisted-core 13.0.0-1ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-19.33-generic 3.11.10.5
Uname: Linux 3.11.0-19-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
Date: Fri May 2 16:35:27 2014
DuplicateSignature: package:python-twisted-core:13.0.0-1ubuntu1:ErrorMessage: symbolic link '/usr/lib/python2.7/dist-packages/twisted/trial/_dist/workercommands.py' size has changed from 70 to 0
ErrorMessage: ErrorMessage: symbolic link '/usr/lib/python2.7/dist-packages/twisted/trial/_dist/workercommands.py' size has changed from 70 to 0
InstallationDate: Installed on 2014-03-11 (52 days ago)
InstallationMedia: Ubuntu-Server 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: twisted
Title: package python-twisted-core 13.0.0-1ubuntu1 failed to install/upgrade: ErrorMessage: symbolic link '/usr/lib/python2.7/dist-packages/twisted/trial/_dist/workercommands.py' size has changed from 70 to 0
UpgradeStatus: Upgraded to trusty on 2014-05-02 (0 days ago)