After some experiments and meditation on the process I have found the
reason for the installation error in my case.

Somehow -- most likely due to my mistake -- the EFI system partition
(ESP) switched to being a logical partition. However, UEFI needs it to
be a primary partition. Since I've already broken other OS installations
on the machine, I have recreated ESP as a primary partition and Ubuntu
20.04 installed fine after that.

I guess it may be a good idea to add a warning to the partition dialog
if such situation is detected.

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https://bugs.launchpad.net/bugs/1872212

Title:
  grub-install: Operation not permitted

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