Comment 2 for bug 2023585

From what I can tell, this is most likely to be a hardware issue like:

 * The graphics card not making clean contact with the slot.
 * Hardware failure of the motherboard.
 * Hardware failure of the graphics card.

But a bit of googling suggests that other people encountering the same error message over the years have sometimes been able to avoid it by tweaking kernel/driver parameters.

The message "Failed to grab modeset ownership" is unrelated and can be ignored here.