ubi-partman error 141 when removing encrypted partition

[Paul Larson]

I'm going through the installer on ther 20120924 amd64 quantal image, and at the partition screen I created:
6G root partition (primary, normal partition)
2G encrypted volume
Once the encrypted volume was created, I clicked on the partition underneath it, and clicked change, but did not give it a mountpoint. Returning to the previous screen, I clicked the "-" on the partition to created it and it gave me the 141 error and asked if I wanted to continue or go back.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubiquity 2.12.2
ProcVersionSignature: Ubuntu 3.5.0-15.22-generic 3.5.4
Uname: Linux 3.5.0-15-generic x86_64
ApportVersion: 2.5.2-0ubuntu4
Architecture: amd64
CasperVersion: 1.324
Date: Mon Sep 24 16:59:09 2012
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20120924)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubiquity - 2.12.4

---------------
ubiquity (2.12.4) quantal; urgency=low

  * Do not offer to remove partitions nor create partition table on the
    loop mounted devices. (LP: #1055640)
  * Skip locked partitions when rebuilding cache, in a similar way as
    skipping free disk space, by sniffing locked file in the partman
    device tree. Remove locked flag, otherwise. (LP: #1055819)
  * Hide mount combo, instead of making it insensitive to reduce clutter
    in the add/edit partition dialog. (LP: #1055815)
  * Automatic update of included source packages: flash-kernel
    3.0~rc.4ubuntu25, grub-installer 1.78ubuntu3.
 -- Dmitrijs Ledkovs <email address hidden> Tue, 25 Sep 2012 13:10:32 +0100