Hi,
during tonights maintenance window our virtualization host dauntless was upgraded to Debian 8. After rebooting, GRUB entered rescue mode as it could not load the linux module (symbol grub_realidt not found). Manual recovery of grub failed with the same error.
Also the BIOS failed to detect the attached emergency-USB flash drive that should be used as fallback in case of boot failure. I have therefore contacted manitu support so that they can ensure that booting from the USB drive gets possible again.
Sorry for the inconveniences,
Alex