i'm seeing this bug in lubuntu-20.04.3-desktop-amd64.iso
my disc has a prior install of kubuntu-20.04.2.0-desktop-amd64.iso:
sda1: /boot/efi
sda2: /
i move all prior content in / into a subdirectory (/fk) leaving only
/lost+found, /swapfile and /fk, launch "install Lubuntu 20.04 LTS",
select manual partitioning, edit "/dev/sda1", select "/boot/efi", "bios-
grub" is already ticked, i tick "boot", click "OK", edit "/dev/sda2",
select "/", click "OK", click "Next", and see
EFI system partition flag not set
An EFI system partition is necessary to start Lubuntu.
A partition was configured with mount point /boot/efi
but its esp flag is not set.
To set the flag, go back and edit the partition.
You can continue without setting the flag but your system
may fail to start.
which as noted in the OP is entirely confusing and bogus. there's no
"esp" flag available in the calamares gui.
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https://bugs.launchpad.net/bugs/1871884
Title:
"EFI system partition flag not set" - false pop-up
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