Ubiquity leaves a scrollbar on screen if you unmounted a partition

[Alan Pope 🍺🐧🐱 🦄]

Boot from a live CD/USB
Mount a local disk from nautilus
Start ubiquity
Popup dialog tells you the disk is mounted, offers to unmount for you, accept that.
Subsequent screens in ubiquity have a scrollbar in the middle of them which you can't remove.

See screenshots

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.9.18
ProcVersionSignature: Ubuntu 3.2.0-16.25-generic 3.2.6
Uname: Linux 3.2.0-16-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CasperVersion: 1.304
Date: Tue Feb 28 10:53:31 2012
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120215)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/942545

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for ubiquity (Ubuntu) because there has been no activity for 60 days.]