do-release-upgrade fails with AttributeError

Binary package hint: update-manager

I started an ec2 instance of ami-bb709dd2 (ubuntu-karmic-9.10-i386-server-20100121.manifest.xml) and attempted do-release-upgrade with --sandbox. The result was:

$ sudo do-release-upgrade --devel-release --sandbox
Checking for a new ubuntu release
Done Upgrade tool signature
Done Upgrade tool
Done downloading
extracting 'lucid.tar.gz'
authenticate 'lucid.tar.gz' against 'lucid.tar.gz.gpg'
tar: Removing leading `/' from member names
tar: /etc/apt/preferences: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errors

Reading cache

A fatal error occurred

Please report this as a bug and include the files
/var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in
your report. The upgrade is now aborted.
Your original sources.list was saved in
/etc/apt/sources.list.distUpgrade.

Traceback (most recent call last):

File "/tmp/tmpW01bDu/lucid", line 7, in <module>
sys.exit(main())

File "/tmp/tmpW01bDu/DistUpgradeMain.py", line 148, in main
app = DistUpgradeController(view, options, datadir=options.datadir)

File "/tmp/tmpW01bDu/DistUpgradeController.py", line 109, in __init__
aufsOptionsAndEnvironmentSetup(self.options, self.config)

File "/tmp/tmpW01bDu/DistUpgradeAufs.py", line 46, in
aufsOptionsAndEnvironmentSetup
if config.getWithDefault("Aufs","EnableFullOverlay", False):

File "/tmp/tmpW01bDu/DistUpgradeConfigParser.py", line 28, in
getWithDefault
return self.getboolean(section, option)

File "/usr/lib/python2.6/ConfigParser.py", line 350, in getboolean
if v.lower() not in self._boolean_states:

AttributeError: 'bool' object has no attribute 'lower'

I'm attaching 'main.log' per output above. The requested /var/log/dist-upgrade/apt.log file does not exist.

ProblemType: Bug
Architecture: i386
Date: Tue Apr 13 15:58:46 2010
DistroRelease: Ubuntu 9.10
Ec2AMI: ami-bb709dd2
Ec2AMIManifest: ubuntu-images-us/ubuntu-karmic-9.10-i386-server-20100121.manifest.xml
Ec2AvailabilityZone: us-east-1b
Ec2InstanceType: m1.small
Ec2Kernel: aki-5f15f636
Ec2Ramdisk: ari-d5709dbc
Package: update-manager-core 1:0.126.9
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: User Name 2.6.31-302.7-ec2
SourcePackage: update-manager
Tags: ec2-images
Uname: Linux 2.6.31-302-ec2 i686