in upgrade to U12.04b2, package python-uno 1:3.5.1-1ubuntu4 failed to install/upgrade: ErrorMessage: subprocess new pre-installation script returned error exit status 1

[seeWallace]

lsb_release now (initially 11.10)
Description: Ubuntu precise (development branch)
Release: 12.04

python-uno:
  Installed: 1:3.5.1-1ubuntu4
  Candidate: 1:3.5.1-1ubuntu4
  Version table:
 *** 1:3.5.1-1ubuntu4 0
        500 http://mirror.internode.on.net/pub/ubuntu/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

This error during upgrade led to all blank-grey launcher icons and inactive, mouseless UI

(Largely repaired via alternate ISO and apt-get -f install )

ProblemType: Package
DistroRelease: Ubuntu 12.04
Package: python-uno 1:3.5.1-1ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
Uname: Linux 3.2.0-21-generic x86_64
ApportVersion: 2.0-0ubuntu2
Architecture: amd64
Date: Sun Apr 1 08:17:24 2012
ErrorMessage: ErrorMessage: subprocess new pre-installation script returned error exit status 1
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: libreoffice
Title: package python-uno 1:3.5.1-1ubuntu4 failed to install/upgrade: ErrorMessage: subprocess new pre-installation script returned error exit status 1
UpgradeStatus: Upgraded to precise on 2012-04-01 (0 days ago)

[Launchpad Janitor (janitor)]

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