Ubuntu 13.10 to 14.04 upgrade failed due to python3 rtupdate file

When upgrading from 13.10 to 14.04 today I had the rtupdate processing fail twice, once on the "onboard" package and once on an ubuntuone package. In both cases the rtupdate file asked dpkg to list the contents of the packages, which were not installed at the time of the query. As a result the postinstall script failed and caused the upgrade process to abort.

I was able to complete the upgrade through the following procedure:
* Install the onboard package to work around that problem
* Remove the ubuntuone rtupdate file found in /usr/share/python3/runtime.d (the package is no longer installable)
* Run apt-get -f install and apt-get dist-upgrade to complete the upgrade.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: python3 3.4.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Fri Apr 25 15:31:31 2014
DuplicateSignature: package:python3:3.4.0-0ubuntu2:ErrorMessage: subprocess installed post-installation script returned error exit status 4
ErrorMessage: ErrorMessage: subprocess installed post-installation script returned error exit status 4
SourcePackage: python3-defaults
Title: package python3 3.4.0-0ubuntu2 failed to install/upgrade: ErrorMessage: subprocess installed post-installation script returned error exit status 4
UpgradeStatus: Upgraded to trusty on 2014-04-25 (0 days ago)