[Bug 1346414] Re: update-manager crashed with AttributeError in update(): 'NoneType' object has no attribute 'saveDistUpgrade'

[Remco Brenninkmeijer]

I was having the same problem but I could not run the above command, it got stuck with only a (I assume) non-relevant warning about a deprecated button use.
Using aptitude it first gave me a warning about unable to update and propose several keeps, but after accepting the keeps it gave an other message about broken packages which it could fix. After this no keeps and it could do a normal update. 
After this, update still did not run but then I discovered there where mere update processes running at the same time. Killing them enabled me to run update and the problem is gone.

So for me the real problem looked to be the broken packages but
unfortunately the broken packages were not logged and I have not noted
them down. For the command line option to run it might give more info
after killing the running update processes.

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https://bugs.launchpad.net/bugs/1346414

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

Status in “update-manager” package in Ubuntu:
  Triaged

Bug description:
  Errors Bucket:
  https://errors.ubuntu.com/bucket/?id=/usr/bin/update-manager%3AAttributeError%3A/usr/bin/update-manager%40121%3Astart_update%3Astart_available%3Arefresh_cache%3Aupdate

  crashed during checking for updates

  ProblemType: CrashDistroRelease: Ubuntu 14.10
  Package: update-manager 1:14.10.2
  ProcVersionSignature: Ubuntu 3.16.0-4.9-generic 3.16.0-rc5
  Uname: Linux 3.16.0-4-generic x86_64
  ApportVersion: 2.14.4-0ubuntu2
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: Unity
  Date: Mon Jul 21 20:29:34 2014
  EcryptfsInUse: Yes
  ExecutablePath: /usr/bin/update-manager
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'launch-time' b'1405963770'
  InstallationDate: Installed on 2014-07-19 (1 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140719)
  InterpreterPath: /usr/bin/python3.4
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /usr/bin/update-manager --no-update
  PythonArgs: ['/usr/bin/update-manager', '--no-update']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 cdrom dip lpadmin plugdev sambashare sudo

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