[Bug 1241010] Re: update-manager -d -c hung in "fetching is complete"

[Otus]

> Had you set RELEASE_UPRADER_ALLOW_THIRD_PARTY in your environment?

Not intentionally, at least.

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https://bugs.launchpad.net/bugs/1241010

Title:
  update-manager -d -c hung in "fetching is complete"

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

Bug description:
  I tried to upgrade from raring to saucy using update-manager -d -c,
  but the upgrade hung after reporting "fetching is complete" in the
  "setting new software channels" step.

  I tried to strace the "saucy" processes, but I didn't really know what
  I was doing. It seemed the parent process was calling poll and the
  children all waiting on futexes... so maybe some kind of deadlock?

  Will try again to see if it is reproducible.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: update-manager 1:0.186.2
  ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
  Uname: Linux 3.8.0-31-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.9.2-0ubuntu8.3
  Aptdaemon:

  Architecture: amd64
  Date: Thu Oct 17 17:08:08 2013
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'launch-time' b'1382018876'
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'window-height' b'315'
   b'com.ubuntu.update-manager' b'window-width' b'484'
  InstallationDate: Installed on 2012-11-10 (341 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to raring on 2013-10-17 (0 days ago)
  --- 
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  CrashDB: ubuntu
  DistroRelease: Ubuntu 13.04
  InstallationDate: Installed on 2012-11-10 (341 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MarkForUpload: True
  NonfreeKernelModules: fglrx
  Package: ubuntu-release-upgrader (not installed)
  ProcVersionSignature: Ubuntu 3.8.0-31.46-generic 3.8.13.8
  Tags:  raring dist-upgrade
  Uname: Linux 3.8.0-31-generic x86_64
  UpgradeStatus: Upgraded to raring on 2013-10-17 (0 days ago)
  UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo
  VarLogDistupgradeAptlog:
   Log time: 2013-10-17 17:11:46.033303
   Log time: 2013-10-17 17:12:21.013451
   Log time: 2013-10-17 17:43:06.073213
  VarLogDistupgradeTermlog:

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