[Bug 1347834] Re: UnboundLocalError: local variable 'e' referenced before assignment in doUpdate, line 924

[Max Bowsher]

This appears to be a coding error. If you look at the file and line
referenced, you see the local variable 'e' being referenced, but it is
not in scope there.

It looks like the code is expecting the captured exception variable from
a previously exited 'except' block to still be in scope after the block
completes. It isn't.

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https://bugs.launchpad.net/bugs/1347834

Title:
  UnboundLocalError: local variable 'e' referenced before assignment in
  doUpdate, line 924

Status in “ubuntu-release-upgrader” package in Ubuntu:
  Confirmed

Bug description:
  Here's the message I got:

  File 
  "/tmp/user/0/ubuntu-release-upgrader-y0kam4fv/DistUpgrade/DistUpgradeController.py", 
  line 1822, in run 
  return self.fullUpgrade() 

  File 
  "/tmp/user/0/ubuntu-release-upgrader-y0kam4fv/DistUpgrade/DistUpgradeController.py", 
  line 1724, in fullUpgrade 
  if not self.doUpdate(): 

  File 
  "/tmp/user/0/ubuntu-release-upgrader-y0kam4fv/DistUpgrade/DistUpgradeController.py", 
  line 924, in doUpdate 
  if not e: 

  UnboundLocalError: local variable 'e' referenced before assignment 
  === Command detached from window (Wed Jul 23 19:26:09 2014) ===
  === Command terminated with exit status 1 (Wed Jul 23 19:26:19 2014) ===

  The problem persists also if I upgrade ubuntu-release-upgrader-core to
  the Utopic version of the software. This was easy to try as do-
  release-upgrade failed to restore my sources.list file to its previous
  state as it crashed and burned.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.2
  ProcVersionSignature: Ubuntu 3.13.0-30.55-generic 3.13.11.2
  Uname: Linux 3.13.0-30-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Jul 23 19:28:51 2014
  InstallationDate: Installed on 2014-05-09 (74 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2014-07-23 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2014-07-23 19:24:30.630772
   Log time: 2014-07-23 19:24:50.648009

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