Comment # 1 on bug 1080395 from Larry Finger

After verifying that Leap 15 was working, I then installed it in one partition
on my SDD. Again, I selected that the boot info be written to the root
partition, not the MBR. I also chose to have standard boot info be written to
the MBR. When the installation was complete, I booted into the rescue system,
and found that the legacy_boot flag was still set on my Tumbleweed partition
(the old one), and not on the Leap 15 root. Using parted, I was able to toggle
the flags.

The problem affects both real and virtual machines.