[Bug 2154293] Re: Enable upgrades from 26.04 to 26.10 on TPM FDE systems

[Dave Jones]

** Merge proposal linked:
   https://code.launchpad.net/~bamf0/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/508975

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https://bugs.launchpad.net/bugs/2154293

Title:
  Enable upgrades from 26.04 to 26.10 on TPM FDE systems

Status in ubuntu-release-upgrader package in Ubuntu:
  In Progress

Bug description:
  Currently TPM FDE upgrades are blocked, however as of the improvement
  on TPM FDE for 26.04 we should re-enable them again. This involves
  integrating operations with snapd in order to first assess whether the
  system is running under TPM FDE, then identifying the correct upgrade
  path, and finally verifying that the upgrade was successful.

  In this case, an upgrade on a TPM FDE hybrid system consists of the
  deb upgrades and remodelling of the model assertion to the later
  version.

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