update-manager crashed with DistUpgrade.DistUpgradeCache.CacheExceptionLockingFailed in __init__(): E:Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable), E:Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

[Tim]

dropbox install error

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: update-manager 1:0.164
ProcVersionSignature: Ubuntu 3.5.0-1.1-generic 3.5.0-rc3
Uname: Linux 3.5.0-1-generic x86_64
ApportVersion: 2.2.5-0ubuntu1
Architecture: amd64
Date: Sun Jun 24 14:06:00 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:

InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120622)
InterpreterPath: /usr/bin/python3.2mu
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/update-manager --dist-upgrade
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
 TERM=unknown
PythonArgs: ['/usr/bin/update-manager', '--dist-upgrade']
SourcePackage: update-manager
Title: update-manager crashed with DistUpgrade.DistUpgradeCache.CacheExceptionLockingFailed in __init__(): E:Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable), E:Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Launchpad Janitor (janitor)]

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

[Mancy (mancy)]

i was on 12.10 beta, while upgrading to release the upgrade process crashed and I am trying all ways to recover

please suggest how to recover from this crash

[Tim (swearingen-tim)]

@Mancy: Fresh install?