Had the same error message installing Ubuntu 20.04.1.  Following Alexei
Lozovsky's advice above, I made my EFI partition the first partition on
the disk, and also made it a primary partition as opposed to a Logical
partition within an extended partition, and the installation completed
successfully.  (My disk is still MBR partitioned, but I am using UEFI).

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

Title:
  grub-install: Operation not permitted

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