[Bug 854490] [NEW] update from natty to oneiric hangs on libpam0g upgrade and cups reload

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TEST CASE:
1. Install Natty and apply updates
2. run update-manager -d and proceed with the upgrade to 11.10

Result:
The upgrade hangs at libpam0g upgrade when cups is reloaded. The last message displayed on console and terminal log is:
Restarting services possibly affected by the upgrade:
  gdm: reloading...done.
  cups: stopping...starting...

The following message is displayed and repeated in syslog
Sep 20 09:19:36 ubuntu-VirtualBox kernel: [ 1893.528204] type=1400 audit(1316503176.331:210): apparmor="STATUS" operation="profile_replace" name="/usr/lib/cups/backend/cups-pdf" pid=18386 comm="apparmor_parser"
Sep 20 09:19:36 ubuntu-VirtualBox kernel: [ 1893.528494] type=1400 audit(1316503176.331:211): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/cupsd" pid=18386 comm="apparmor_parser"
Sep 20 09:19:36 ubuntu-VirtualBox init: cups main process (18387) terminated with status 127
Sep 20 09:19:36 ubuntu-VirtualBox init: cups main process ended, respawning

The following cups processes are running:
root     16275  0.0  0.0   2028   512 pts/2    S+   09:11   0:00 /bin/sh -e /etc/init.d/cups start
root     16279  0.0  0.1   4944  1292 pts/2    S+   09:11   0:00 start cups

Killing process 16275 allows to continue the upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.3
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic i686
Architecture: i386
Date: Tue Sep 20 09:13:29 2011
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/window_size=(600,600)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2011-09-20 (0 days ago)

** Affects: pam (Ubuntu)
     Importance: Critical
     Assignee: Steve Langasek (vorlon)
         Status: Confirmed

** Affects: pam (Ubuntu Oneiric)
     Importance: Critical
     Assignee: Steve Langasek (vorlon)
         Status: Confirmed


** Tags: apport-bug i386 iso-testing natty
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update from natty to oneiric hangs on libpam0g upgrade and cups reload
https://bugs.launchpad.net/bugs/854490
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