[Bug 911082] Re: meta-release can be corrupted on network error

[Alessander Botti Benevides]

I had the same issue for upgrading Kubuntu 12.10 to 13.04. However, my previous solution did not work. Following a hint given on [1], I did
$ export DEBUG_UPDATE_MANAGER=true
$ do-release-upgrade -c
and noticed the line:
reading file '/home/username/.cache/update-manager-core/meta-release'

So, I removed '/home/username/.cache/update-manager-core/meta-release' and did do-release-upgrade -c again and it fixed both
"/home/username/.cache/update-manager-core/meta-release" and "/var/lib/update-manager/meta-release".

[1] https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/653412

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https://bugs.launchpad.net/bugs/911082

Title:
  meta-release can be corrupted on network error

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

Bug description:
  I had trouble upgrading my laptop from 11.04 to 11.10:

  # do-release-upgrade 
  Checking for a new ubuntu release
  No new release found

  I checked /var/lib/update-manager/meta-release only to find the HTML
  source of a wi-fi paywall splash page.

  The process that fetches this file should check that it's valid before
  downloading.

  Related: https://bugs.launchpad.net/ubuntu/+source/update-
  manager/+bug/521765

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