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

[Brian Murray]

*** This bug is a duplicate of bug 1310891 ***
    https://bugs.launchpad.net/bugs/1310891

** This bug has been marked a duplicate of bug 1310891
   cached meta-release file should not be saved if it is html

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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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