[Bug 1795024] Re: release-upgrades Prompt to anything other than normal prevents beta upgrades

[Ted Cabeen]

Okay, I guess that makes sense.  Prompt=lts would prevent upgrade from
18.04 to 18.10, 19.04, and 19.10.  When 20.04 comes out, Prompt=lts
would then hopefully allow upgrade to the development version with -d.
I'll see what the update-manager team comes up with on this one.

In the meantime, can we change the comments in the /etc/update-manager
/release-upgrades file to note this behaviour?  Right now, it only
describes the impact on whether the user is prompted to upgrade.  It
should also describe that it controls whether you will be able to
perform the upgrades.

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https://bugs.launchpad.net/bugs/1795024

Title:
  release-upgrades Prompt to anything other than normal prevents beta
  upgrades

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in update-manager package in Ubuntu:
  Triaged

Bug description:
  The prompt setting in /etc/update-manager/release-upgrades controls
  whether the user is prompted to upgrade, but also controls whether the
  user can manually upgrade using do-release-upgrade -d.

  Steps to reproduce:
  1) On an 18.04 machine, set Prompt in /etc/update-manager/release-upgrades to lts or never.
  2) Attempt to upgrade to 18.10 beta using do-release-upgrade -d.  
  3) The upgrade reports "Upgrades to the development release are only available from the latest supported release."  This is both an incorrect error message, and it prevents upgrade even though the user has specifically requested the development version.

  Possible fixes:
  1) The documentation should be changed to indicate that the Prompt argument controls both whether you are prompted to upgrade, but also whether you can use the upgrade tool at all.
  2) A second configuration option should be added to allow the admin to control the prompting for upgrade separately from the ability to upgrade, allowing users to upgrade the system manually, even when Prompt is set to never.

  Question:  Is the default setting of Prompt=lts going to prevent users
  from upgrading their 18.04 machines to 18.10 until they change it to
  normal?

  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04

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