[Bug 898482] Re: Lucid to Precise upgrade fails: release upgrader fails to start

[cpatrick08]

i tried to do sudo update-manager -c -d in the terminal and got
following error message

authenticate 'precise.tar.gz' against 'precise.tar.gz.gpg' 
extracting 'precise.tar.gz'
WARNING: Failed to read mirror file
Traceback (most recent call last):
  File "/tmp/tmpASDH1E/precise", line 7, in <module>
    sys.exit(main())
  File "/tmp/tmpASDH1E/DistUpgradeMain.py", line 218, in main
    if app.run():
  File "/tmp/tmpASDH1E/DistUpgradeController.py", line 1687, in run
    return self.fullUpgrade()
  File "/tmp/tmpASDH1E/DistUpgradeController.py", line 1561, in fullUpgrade
    if not self.getRequiredBackports():
  File "/tmp/tmpASDH1E/DistUpgradeController.py", line 1504, in getRequiredBackports
    self._view.getInstallProgress())

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https://bugs.launchpad.net/bugs/898482

Title:
  Lucid to Precise upgrade fails: release upgrader fails to start

Status in “update-manager” package in Ubuntu:
  Fix Released
Status in “update-manager” source package in Precise:
  Fix Released

Bug description:
  Just tried a Lucid to Precise Alpha 1 dist-upgrade by running "update-
  manager -d -c" and the Update Manager shows 12.04 available but
  clicking on Upgrade just causes the terminal to output:

  can't load DistUpgradeViewGtk (Unknown internal child: selection)
  can't load DistUpgradeViewGtk3 (No module named gi)
  can't load DistUpgradeViewKDE (coercing to Unicode: need string or buffer, tuple found)
  Must be connected to a terminal.

  I had not thought of even trying this earlier as I'd doubt any early
  testers would typically do that but I thought I should report it all
  the same.

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