UnicodeEncodeError: 'ascii' codec can't encode character u'\xbb' in position 1: ordinal not in range(128)

[Arnd]

When trying to perform a do-release-upgrade from precise to quantal,
the upgrade is aborted, when I try to view the "details" of the upgrade:

 Fortsetzen [j/N] Details [d]d

Ein schwerwiegender Fehler ist aufgetreten

Bitte erstellen Sie einen Fehlerbericht und fügen Sie die Dateien
/var/log/dist-upgrade/main.log und /var/log/dist-upgrade/apt.log
hinzu. Die Systemaktualisierung wurde abgebrochen.
Ihre ursprüngliche sources.list wurde in
/etc/apt/sources.list.distUpgrade gesichert.

Traceback (most recent call last):

File "/tmp/update-manager-k4qYCD/quantal", line 10, in <module>
sys.exit(main())

File "/tmp/update-manager-k4qYCD/DistUpgrade/DistUpgradeMain.py",
line 240, in main
if app.run():

File
"/tmp/update-manager-k4qYCD/DistUpgrade/DistUpgradeController.py",
line 1764, in run
return self.fullUpgrade()

File
"/tmp/update-manager-k4qYCD/DistUpgrade/DistUpgradeController.py",
line 1721, in fullUpgrade
if not self.askDistUpgrade():

File
"/tmp/update-manager-k4qYCD/DistUpgrade/DistUpgradeController.py",
line 969, in askDistUpgrade
self.cache.required_download)

File "/tmp/update-manager-k4qYCD/DistUpgrade/DistUpgradeViewText.py",
line 195, in confirmChanges
self.showInPager(output)

File "/tmp/update-manager-k4qYCD/DistUpgrade/DistUpgradeViewText.py",
line 143, in showInPager
p.stdin.write(output)

UnicodeEncodeError: 'ascii' codec can't encode character u'\xbb' in
position 1: ordinal not in range(128)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager-core 1:0.156.14.11
Uname: Linux 3.8.0-rc6aha1+ x86_64
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Wed Feb 20 10:36:58 2013
EcryptfsInUse: Yes
GsettingsChanges:

MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2013-02-20 (0 days ago)

[Arnd (arnd-arndnet)]

FYI, the following does work:
export LANG=C; do-release-upgrade -d

This bug is most probably locale related...

[Launchpad Janitor (janitor)]

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