update-manager crashed with AttributeError in update(): 'NoneType' object has no attribute 'saveDistUpgrade'

[Pawel Suchy]

.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: update-manager 1:0.196.7
ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
Uname: Linux 3.13.0-16-generic i686
ApportVersion: 2.13.3-0ubuntu1
Architecture: i386
CurrentDesktop: Unity
Date: Sun Mar 9 10:38:35 2014
ExecutablePath: /usr/bin/update-manager
InstallationDate: Installed on 2014-03-05 (3 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140304)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/update-manager
PythonArgs: ['/usr/bin/update-manager']
SourcePackage: update-manager
Title: update-manager crashed with AttributeError in update(): 'NoneType' object has no attribute 'saveDistUpgrade'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm lpadmin sambashare sudo

[Sebastien Bacher (seb128)]

e.u.c report on https://errors.ubuntu.com/problem/dfe2c51da30166d04aaf4bdfe4e5cd5749178c7e

[Launchpad Janitor (janitor)]

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

[kin jos (burny-c)]

change server repository location ,this is my solution