[Bug 2154602] Re: [SRU] release-upgrades Prompt should be lts for Resolute Racoon

[Carlos Nihelton]

** Description changed:

+ [ Impact ]
+ 
+ LTS users are supposed to upgrade only when a new LTS is available, thus
+ skipping interim releases for greater stability. For other LTSes the
+ `/etc/update-manager/release-upgrades` file correctly defines
+ `Prompt=lts`, but on Resolute Racoon we have `Prompt=normal`, what
+ allows upgrading into the next interim release. The proposed fix makes
+ RR behave as any previous LTS release of Ubuntu.
+ 
+ [ Test Plan ]
+ 
+ * Set up a LXD container from Ubuntu 26.04 LTS.
+ * Confirm that the existing `/etc/update-manager/release-upgrades` file sets `Prompt=normal`
+ * Try triggering an upgrade (but do not allow it to proceed). It should succeed in finding the in-development interim release or fail with an error message that doesn't mention LTS. For example:
+ 
+ ```
+ root at u1:~# sudo do-release-upgrade -d
+ Checking for a new Ubuntu release
+ Could not find the release announcement
+ The server may be overloaded.
+ ``` 
+ 
+ * Install ubuntu-release-upgrader-core from resolute-proposed
+ * Confirm that `/etc/update-manager/release-upgrades` now sets `Prompt=lts`
+ * Try triggering an upgrade. The error message should mention the unavailability of an LTS release in development.
+ 
+ ```
+ root at u1:~# sudo do-release-upgrade -d
+ Checking for a new Ubuntu release
+ There is no development version of an LTS available.
+ To upgrade to the latest non-LTS development release 
+ set Prompt=normal in /etc/update-manager/release-upgrades.
+ ```
+ 
+ [ Where problems could occur ]
+ 
+ Failing to set the correct policy for an LTS system either risks the
+ capacity to upgrade the users's systems (if set to a wrong value like
+ `never`) or their stability (if allowed to upgrade to interim releases,
+ as it's the case for RR as of now).
+ 
+ [ Other Info ]
+ 
  I've seen a number of fresh installed instances of Resolute in which the
  `Prompt` value in the `release-upgrades` is set to `normal` instead of
  `lts` (desktop, LXD containers, WSL). I suspect we missed a step to
  update the matching file in the `ubuntu-release-upgrader` source
  package.
- 
- [WIP]

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https://bugs.launchpad.net/bugs/2154602

Title:
  [SRU] release-upgrades Prompt should be lts for Resolute Racoon

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Resolute:
  Confirmed

Bug description:
  [ Impact ]

  LTS users are supposed to upgrade only when a new LTS is available,
  thus skipping interim releases for greater stability. For other LTSes
  the `/etc/update-manager/release-upgrades` file correctly defines
  `Prompt=lts`, but on Resolute Racoon we have `Prompt=normal`, what
  allows upgrading into the next interim release. The proposed fix makes
  RR behave as any previous LTS release of Ubuntu.

  [ Test Plan ]

  * Set up a LXD container from Ubuntu 26.04 LTS.
  * Confirm that the existing `/etc/update-manager/release-upgrades` file sets `Prompt=normal`
  * Try triggering an upgrade (but do not allow it to proceed). It should succeed in finding the in-development interim release or fail with an error message that doesn't mention LTS. For example:

  ```
  root at u1:~# sudo do-release-upgrade -d
  Checking for a new Ubuntu release
  Could not find the release announcement
  The server may be overloaded.
  ``` 

  * Install ubuntu-release-upgrader-core from resolute-proposed
  * Confirm that `/etc/update-manager/release-upgrades` now sets `Prompt=lts`
  * Try triggering an upgrade. The error message should mention the unavailability of an LTS release in development.

  ```
  root at u1:~# sudo do-release-upgrade -d
  Checking for a new Ubuntu release
  There is no development version of an LTS available.
  To upgrade to the latest non-LTS development release 
  set Prompt=normal in /etc/update-manager/release-upgrades.
  ```

  [ Where problems could occur ]

  Failing to set the correct policy for an LTS system either risks the
  capacity to upgrade the users's systems (if set to a wrong value like
  `never`) or their stability (if allowed to upgrade to interim
  releases, as it's the case for RR as of now).

  [ Other Info ]

  I've seen a number of fresh installed instances of Resolute in which
  the `Prompt` value in the `release-upgrades` is set to `normal`
  instead of `lts` (desktop, LXD containers, WSL). I suspect we missed a
  step to update the matching file in the `ubuntu-release-upgrader`
  source package.

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