I followed the instructions to upgrade from Ubuntu 19.10 to the final release of 20.04 LTS—

  1. Ensure that you have all updates installed.
  2. Set "Notify me of a new Ubuntu version" to "For any new version".
  3. Run update-manager -c -d.

—and was greeted by this message:

This release is still in development. Do not install it on production machines.

Why does it say this? What would happen if I continue anyway? I double-checked the instructions and there's no indication of how to handle this. I'm not sure if I should:

  • ignore the warning and continue with the upgrade,
  • take some action to resolve a problem on my end, or
  • wait for a problem to be resolved externally.


  • The message seems to be coming from this file. There's an analogous one with the messaging I'd expect. Maybe something is just showing me the wrong one?
  • This answer (and later DEBUG_UPDATE_MANAGER=1) led me to the release and development release manifests, which link correspondingly to the two message variants. The release manifest doesn't include 20.04 LTS, which might help explain this question.
  • That the upgrade instructions specify -d suggests that 20.04 LTS is indeed expected to be a development release. Perhaps I'm mistaken about what it means to be a final release (it's a type of development release?), or the project is simply running behind schedule?
  • I asked about this in #ubuntu. A member of the Ubuntu Security Team confirmed that the omission from the release manifest is deliberate, to be changed "when 20.04 is a bit more stable and better tested". This is consistent with the hypothesis that 20.04 LTS is actually a development release, but contradicts the release schedule and announcement.
  • The mailing list announcement says:

    Users of Ubuntu 19.10 will be offered an automatic upgrade to 20.04 LTS via Update Manager shortly.

  • This answer recounts precedent for delaying the update of the release manifest for a few days after the official release, and warns that bypassing the delay with -d constitutes an acceptance of risk as a tester.
  • 1
    I read somewhere that the upgrade from a previous version in only really supported once Canonical publishes the first point release (20.04.1)...
    – xenoid
    Apr 24, 2020 at 21:40
  • No; it draws a distinction between development and final releases, but doesn't explain why 20.04 LTS is being described as both. It documents special procedures for updating from 18.04 LTS, but not from 19.10.
    – ændrük
    Apr 25, 2020 at 3:56
  • We are end users as well as you and we don't know more than you. I think you should ask the developers at Canonical, and one way is via a bug report at Launchpad. Another way is to start a thread at Ubuntu Discourse. Please post here if you get an answer over there.
    – sudodus
    Apr 25, 2020 at 15:43
  • 1
    I think you have found a bug in the release notes. update-manager should not require -d after release.
    – user535733
    Apr 25, 2020 at 15:57
  • from lah7 Administrator ubuntu-mate.community/t/ubuntu-mate-19-10-final-release-is-out/… "19.10's packages are in their final state, so it is safe to use update-manager -d to upgrade right away."
    – MeSo2
    Apr 27, 2020 at 14:49


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