[Bug 1936401] Re: Migrate Pi users away from u-boot in impish

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~waveform/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/406663

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https://bugs.launchpad.net/bugs/1936401

Title:
  Migrate Pi users away from u-boot in impish

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

Bug description:
  Currently we have a different boot sequence on the Pi depending on
  which release is used:

  * Focal images (and prior) all use u-boot

  * Groovy images (and onwards) don't

  * However, upgraders from Focal to Groovy aren't forced off u-boot;
  their boot configuration remains untouched

  We should update user's boot configuration to migrate them off u-boot
  if they're still on it prior to upgrade to impish. This should be
  added as a quirk to do-release-upgrade. The primary complexity is that
  the Focal boot configuration is split into three files which should be
  merged. Logic from pibootctl's parser can be used for a lot of this.

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