Error aborted installation of Quantal alpha; AttributeError: 'Deb822' object has no attribute 'has_key'

Happened pretty far into installation

kvm installation to qcow2 format disk.

/, swap, and bios-loader (grub) partition

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubiquity 2.11.23 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 3.5.0-11.11-generic 3.5.2
Uname: Linux 3.5.0-11-generic i686
ApportVersion: 2.5.1-0ubuntu2
Architecture: i386
CasperVersion: 1.321
Date: Sun Aug 26 21:37:00 2012
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd.lz quiet splash --
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120825)
ProcEnviron:
 TERM=unknown
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

Aug 27 01:33:42 ubuntu ubiquity: Processing triggers for update-notifier-common ...
Aug 27 01:33:43 ubuntu ubiquity: Traceback (most recent call last):
Aug 27 01:33:43 ubuntu ubiquity: File "/usr/lib/update-notifier/package-data-downloader", line 296, in <module>
Aug 27 01:33:43 ubuntu ubiquity: process_download_requests()
Aug 27 01:33:43 ubuntu ubiquity: File "/usr/lib/update-notifier/package-data-downloader", line 212, in process_download_requests
Aug 27 01:33:43 ubuntu ubiquity: if para.has_key('script'):
Aug 27 01:33:43 ubuntu ubiquity: AttributeError: 'Deb822' object has no attribute 'has_key'
Aug 27 01:33:43 ubuntu ubiquity: dpkg: error processing update-notifier-common (--unpack):
Aug 27 01:33:43 ubuntu ubiquity: subprocess installed post-installation script returned error exit status 1
Aug 27 01:33:43 ubuntu ubiquity: No apport report written because MaxReports is reached already