I've just tried it with Win10 and Ubuntu 20.04. Both worked out of the box on an UEFI system (no legacy boot) without SecureBoot. FWIW this is on a cheap lapto

I've just tried it with Win10 and Ubuntu 20.04. Both worked out of the box on an UEFI system (no legacy boot) without SecureBoot. FWIW this is on a cheap laptop with buggy UEFI which gave me some boot problems in the past, so that gives me some hope.