[Bug 1210172] Re: upgrade from precise to quantal fails with fatal error

[David Tucci]

** Attachment added: "/var/log/dist-upgrade/apt.log"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1210172/+attachment/3765058/+files/apt.log

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https://bugs.launchpad.net/bugs/1210172

Title:
  upgrade from precise to quantal fails with fatal error

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

Bug description:
  A fatal error occurred
  Please report this as a bug and include the files
  /var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in
  your report. The upgrade has aborted.
  Your original sources.list was saved in
  /etc/apt/sources.list.distUpgrade.
  Traceback (most recent call last):
  File "/tmp/update-manager-vyiB5S/quantal", line 10, in <module>
  sys.exit(main())
  File "/tmp/update-manager-vyiB5S/DistUpgrade/DistUpgradeMain.py",
  line 240, in main
  if app.run():
  File
  "/tmp/update-manager-vyiB5S/DistUpgrade/DistUpgradeController.py",
  line 1764, in run
  return self.fullUpgrade()
  File
  "/tmp/update-manager-vyiB5S/DistUpgrade/DistUpgradeController.py",
  line 1721, in fullUpgrade
  if not self.askDistUpgrade():
  File
  "/tmp/update-manager-vyiB5S/DistUpgrade/DistUpgradeController.py",
  line 969, in askDistUpgrade
  self.cache.required_download)
  File "/tmp/update-manager-vyiB5S/DistUpgrade/DistUpgradeViewText.py",
  line 165, in confirmChanges
  downloadSize, actions)
  File "/tmp/update-manager-vyiB5S/DistUpgrade/DistUpgradeView.py",
  line 384, in confirmChanges
  downloadSizeStr = downloadSizeStr.decode(ENCODING)
  TypeError: decode() argument 1 must be string, not None

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