Convert existing Tails devices to UEFI on full upgrade
When upgrading an existing Tails device with Tails Installer, turn the system partition into an ESP, just like we already do (at least in liveusb-creator 3.11.6+tails1-3 and later) on initial installation.
Relevant code lines that one can get inspiration from:
partition_type = 'C12A7328-F81F-11D2-BA4B-00A0C93EC93B' self._set_partition_flags(1, SYSTEM_PARTITION_FLAGS)
Feature Branch: installer:feature/6577-convert-to-UEFI
Parent Task: #5739 (closed)