unattended-upgrade crashed with AttributeError in conffile_prompt()

[Robert B]

As this is a backport of a patch that is working on maverick already a regression
test should be enough.
TEST CASE:
1. install lucid
2. install unattended-upgrades from lucid-prospoed
3. run sudo unattended-upgrades -d
4. verify that the upgrades are downloaded and installed

Binary package hint: unattended-upgrades

$ lsb_release -rd
Description: Ubuntu lucid (development branch)
Release: 10.04
$ apt-cache policy unattended-upgrades
unattended-upgrades:
  Installed: 0.55ubuntu3
  Candidate: 0.55ubuntu3
  Version table:
 *** 0.55ubuntu3 0
        100 /var/lib/dpkg/status

I expected it to not crash, but it did.

ProblemType: Crash
DistroRelease: Ubuntu 10.04
Package: unattended-upgrades 0.55ubuntu3
ProcVersionSignature: Ubuntu 2.6.32-21.31-generic-pae 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic-pae i686
Architecture: i386
Date: Thu Apr 15 07:26:05 2010
ExecutablePath: /usr/bin/unattended-upgrade
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100213)
InterpreterPath: /usr/bin/python2.6
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/unattended-upgrade
ProcEnviron:
 PATH=(custom, no user)
 SHELL=/bin/sh
PythonArgs: ['/usr/bin/unattended-upgrade']
SourcePackage: unattended-upgrades
Title: unattended-upgrade crashed with AttributeError in conffile_prompt()
UserGroups:

[Martin Pitt (pitti)]

Accepted unattended-upgrades into lucid-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

[Jean-Baptiste Lallement (jibel)]

SRU verification for Lucid:
I have reproduced the problem with unattended-upgrades 0.55ubuntu4 in lucid-updates and have verified that the version of unattended-upgrades 0.55ubuntu5 in -proposed fixes the issue.

Marking as verification-done

[Launchpad Janitor (janitor)]

This bug was fixed in the package unattended-upgrades - 0.55ubuntu5

---------------
unattended-upgrades (0.55ubuntu5) lucid-proposed; urgency=low

  * unattended-upgrade:
    - backport fix for a crash when a package has no conffiles
      anymore (LP: #563912)
    - fix crash on download error (DescURI is not a valid attribute)
      LP: #591171
 -- Michael Vogt <email address hidden> Mon, 10 Jan 2011 18:55:25 +0100