[Bug 1809920] Re: prompt to upgrade to 18.04 shows while upgrade to 16.04 is still in progress

[Brian Murray]

There is a RELEASE_UPGRADE_IN_PROGRESS environmental variable which gets
set to 1 when the release upgrade starts but it was check-new-release-
gtk that presented the dialog so we'll need a different way to denote
that a release upgrade is already happening.

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https://bugs.launchpad.net/bugs/1809920

Title:
  prompt to upgrade to 18.04 shows while upgrade to 16.04 is still in
  progress

Status in update-manager package in Ubuntu:
  New
Status in update-manager source package in Xenial:
  New

Bug description:
  While upgrading a desktop system from 14.04 to 16.04 over the
  holidays, I was prompted to upgrade to 18.04... while the upgrade to
  16.04 was still running.

  I don't know what would happen if I clicked 'yes', but I'm sure it
  wouldn't DTRT.

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