[Bug 2151257] [NEW] Release-upgrades prompts for normal releases by default on LTS version

[Ewan Pols]

Public bug reported:

Ubuntu version: Ubuntu 26.04 LTS

ubuntu-release-upgrader-core:
  Version: 1:26.04.18

Normally, Ubuntu LTS versions offer only upgrades to new LTS versions by
default by setting `Prompt=lts` `/etc/update-manager/release-upgrades`.
However, in Ubuntu 26.04, this file is set to `Prompt=normal`by default,
leading to an upgrade notification when 26.10 is released in October. As
this was not the case in previous releases (and inconsistent with the
intent of using LTS), and users cannot change their settings using the
GUI as `software-properties-gtk`is dropped from the default install,
this behaviour seems unintended and might lead to confusion for users.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2151257

Title:
  Release-upgrades prompts for normal releases by default on LTS version

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

Bug description:
  Ubuntu version: Ubuntu 26.04 LTS

  ubuntu-release-upgrader-core:
    Version: 1:26.04.18

  Normally, Ubuntu LTS versions offer only upgrades to new LTS versions
  by default by setting `Prompt=lts` `/etc/update-manager/release-
  upgrades`. However, in Ubuntu 26.04, this file is set to
  `Prompt=normal`by default, leading to an upgrade notification when
  26.10 is released in October. As this was not the case in previous
  releases (and inconsistent with the intent of using LTS), and users
  cannot change their settings using the GUI as `software-properties-
  gtk`is dropped from the default install, this behaviour seems
  unintended and might lead to confusion for users.

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