[Bug 1221691] Re: do-release-upgrade incorrectly reports no upgrade available

[Brian Murray]

** Tags added: precise

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1221691

Title:
  do-release-upgrade incorrectly reports no upgrade available

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

Bug description:
  I just created a "chroot" oneiric. I then ran do-release-upgrade to go
  to precise. Next I changed "Prompt=ltr" back to "Prompt=normal" (in
  update-manager/release-upgrades).

  Then when I ran do-release-upgrade again, to try to upgrade to quantal
  I got "no upgrade available", while we're up to rascal already.

  It turns out that my resolv.conf had become invalid during the upgrade
  to precise. That's not the problem. The problem is that do-release-
  upgrade apparently encounters an error (host cannot be resolved), and
  instead of reporting on the error reports a "valid output" for the
  program.

  I recognize that people might be offline and therefore get resolver
  errors. But the good thing about Linux is that you get error messages
  that help you solve the problem. So in this case a:

  no upgrade available because: can't resolve hostname
  upgrade.ubuntu.com

  - maintains the "business part" that no upgrade is currently possible, 
  - but in case that is an error that can/needs to be solved, provides a hint as to what is wrong. 

  This was when upgrading from Precise to Quantal. It's a bug that needs
  "fixing" in an older release first, because for the current release
  the message "no release available" is the proper one. (hmmm. well if
  you just change the error message that should be testable).....

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