I can now consistently reproduce this error message on -71 by hitting <Enter> to choose "Ubuntu" on the GRUB menu as soon as it appears. If I leave the GRUB menu to time out and then start -71, then it does not occur.
So it looks as though it might be a race condition?
I cannot reproduce this when I choose -70. But that requires three keypresses and that perhaps takes too long to trigger the condition.
I can now consistently reproduce this error message on -71 by hitting <Enter> to choose "Ubuntu" on the GRUB menu as soon as it appears. If I leave the GRUB menu to time out and then start -71, then it does not occur.
So it looks as though it might be a race condition?
I cannot reproduce this when I choose -70. But that requires three keypresses and that perhaps takes too long to trigger the condition.