After updating to the proposed kernel, I was able to boot a xenial cloud image with qemu-efi from both xenial (DTB mode) and bionic (ACPI mode).
** Attachment added: "dmesg-xenial-host.txt" https://bugs.launchpad.net/ubuntu/+source/edk2/+bug/1744754/+attachment/5084478/+files/dmesg-xenial-host.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1744754 Title: qemu-efi-aarch64 in >= artful can't boot xenial cloud images To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-images/+bug/1744754/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs