Hello,
There is bug reported about grub2-install 2240994 for a while but no solution are proposed.
grub2-install: error: This utility should not be used for EFI platforms because it does not support UEFI Secure Boot. If you really wish to proceed, invoke the --force option. Make sure Secure Boot is disabled before proceeding.
=========================================================================== Patrick DUPRÉ | | email: pdupre@gmx.com ===========================================================================