Question about the boot flag for Calamares installer

[pebcak]

You won’t actually be needing any “flags” on ESP post-install. It is identified by its partition type GUID. See here:

https://wiki.archlinux.org/index.php/ESP#GPT_partitioned_disks

And also:

[not a bug] ESP should be on /boot, not /boot/esp

The GPT specifications do not actually use “flags.” That is a peculiarity of parted and gparted (and kpmcore does this as well) that still insist on referring to flags when there are none. What parted is doing when you set the “boot flag” is actually changing the partition GUID to the agreed upon GUID for EFI partitions, in this case: C12A7328-F81F-11D2-BA4B-00A0C93EC93B is the GUID of an EFI partition. The boot loaders know that GUID belongs to the EFI partition. There is no real flag being set…