device: 0.827
graphic: 0.501
semantic: 0.257
boot: 0.141
mistranslation: 0.111
vnc: 0.058
other: 0.048
instruction: 0.024
assembly: 0.014
KVM: 0.013
network: 0.010
socket: 0.004

MBR/Partition table corruption/loss , probably related to virtual sata disks and backup