Comment 151 for bug 1886148

@xnox, thank you!

Now groovy-desktop-arm64.iso is recognized as bootable by Lenovo Yoga C630 WOS (I will check RPi3B and r3399 uefi implementations later, but that most likely work too).

There is still black screen issue I described earlier: https://discourse.ubuntu.com/t/groovy-to-use-grub2-for-booting-installer-media-in-any-modes-on-all-architectures/16871/29
So I filled separate report about it: Bug 1898823