[Bug 2119049] Re: [SRU] Handle rename of u-boot-amlogic as part of noble backport

[Dave Jones]

Additionally: installation of u-boot-amlogic (the empty transitional
package) correctly pulls in u-boot-amlogic-binaries, so existing
instructions to install u-boot-amlogic will continue to operate
correctly with the new package in place.

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Title:
  [SRU] Handle rename of u-boot-amlogic as part of noble backport

Status in u-boot package in Ubuntu:
  Fix Released
Status in u-boot source package in Plucky:
  Fix Committed
Status in u-boot source package in Questing:
  Fix Released

Bug description:
  [ Impact ]

  See where things could go wrong section for full description;
  somewhere between "nothing" and "broken boot".

  [ Test Plan ]

  For each affected series:

  * Under an Ubuntu arm-based image, install u-boot-amlogic from an older version (<2025)
  * Run upgrade to proposed version
  * Ensure upgrade pulls in u-boot-amlogic-binaries

  * Under an Ubuntu noble arm-based image, install a pre-2024 version
  * dist-upgrade to a later release
  * Ensure dist-upgrade also pulls in u-boot-amlogic-binaries package automatically

  Note: we don't require the board used for this to actually use u-boot-
  amlogic; this is not testing the bootloader function just the package
  rename

  [ Where things could go wrong ]

  The bootloader functionality is not under consideration with this
  change as we don't have any boards that actually use this package any
  more. The only question is whether both upgrade and dist-upgrade will
  implicitly migrate the u-boot-amlogic package to u-boot-amlogic-
  binaries.

  If it does not, the best case scenario is either that no (extant)
  boards still use this package, or that they continue booting because
  (for example) the bootloader itself is only flashed manually. The
  worst case scenario is this leaves anyone relying on this package with
  a broken boot (assuming whatever is flashing boot assets will flash
  them automatically, even when the bootloader is missing).

  [ Original Description ]

  During the backport of 2025.01 to noble (to mitigate the movement to
  RVA23 as part of questing) (LP: #2110301), the SRU team noted that
  u-boot-amlogic has been replaced by u-boot-amlogic-binaries, and that
  the effective renaming of this package should have an empty
  transitional package and "Provides" clause to comply with renaming
  practices [1]. This change is also required in the plucky and questing
  releases.

  [1]: https://wiki.debian.org/PackageTransition case 5

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