@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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1886148 Title: failure to boot groovy daily To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-cdimage/+bug/1886148/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs