Public bug reported:

=== Problem ===
Unable to upgrade from Ubuntu 11.04 (Natty Narwhal) to Ubuntu 11.10 (Oneiric 
Ocelot) using update-manager --dist-upgrade tool. 


=== Repro ===
1. ALT+F2
2. update-manager --dist-upgrade

=== Actual result ===
An error message occurs while trying to upgrade to 11.10
"""
Unable to get exclusive lock

This usually means that another package management application (like apt-get or 
aptitude) already running. Please close that application first.
"""

Neither apt nor synaptic nor dpkg processes is running.
Manual clean of /var/lib/dpkg/lock doesn't help to fix this.
No broken packages are present in system.


root@goldilocks:/home/jk7# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 11.04
Release:        11.04
Codename:       natty

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.5.2
ProcVersionSignature: Ubuntu 2.6.38-13.55-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic i686
NonfreeKernelModules: fglrx
Architecture: i386
Date: Fri Feb 17 10:57:38 2012
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=oneiric
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=true
 /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 2012-02-17 (0 days ago)
VarLogDistupgradeApttermlog:
 
VarLogDistupgradeHistorylog:
 
VarLogDistupgradeSystemstatetargz:
 
VarLogDistupgradeTermlog:

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 natty

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https://bugs.launchpad.net/bugs/934499

Title:
  Unable to upgrade from 11.04 to 11.10

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