And so it's clear how this size is determined by fwupd it's based on the
size of the payload the system will be using (IE the SPI size):

https://github.com/fwupd/fwupd/blob/9713cead62e79da26d4c5637dd9682b21a9f0b21/plugins/uefi-
capsule/fu-uefi-device.c#L635

The size is doubled because often the firmware updater will make a
backup of the SPI to the ESP or will extract the payload while updating.

I think a reasonable default would be to ensure that there is 128MB of
free space available to cover up to a 64Mb SPI part and a backup.

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https://bugs.launchpad.net/bugs/2064023

Title:
  Installer should detect small ESP in a dual boot

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