Ubuntu VM No Longers Boots

Hi,

I have been away on holiday and on my return I can no longer log into my VM, I have rebooted the whole server but cannot get it to boot.  below is the log, can anyone throw a bone?

2018-08-14 07:26:04.087+0000: starting up libvirt version: 4.0.0, qemu version: 2.11.1, hostname: UNRAIDSERVER
LC_ALL=C PATH=/bin:/sbin:/usr/bin:/usr/sbin HOME=/ QEMU_AUDIO_DRV=none /usr/local/sbin/qemu -name guest=Ubuntu,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-5-Ubuntu/master-key.aes -machine pc-q35-2.11,accel=kvm,usb=off,dump-guest-core=off,mem-merge=off -cpu host -m 4096 -realtime mlock=off -smp 2,sockets=1,cores=1,threads=2 -uuid 19e5d68a-a176-e348-2a69-6a4e4331022d -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-5-Ubuntu/monitor.sock,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet -no-shutdown -boot strict=on -device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 -device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 -device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 -device pcie-root-port,port=0x13,chassis=4,id=pdev=charserial0,id=serial0 -chardev socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/domain-5-Ubuntu/org.qemu.guest_agent.0,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0 -device usb-tablet,id=input0,bus=usb.0,port=1 -vnc 0.0.0.0:0,websocket=5700,password -k en-gb -device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1 -device virtio-balloon-pci,id=balloon0,bus=pci.4,addr=0x0 -msg timestamp=on
2018-08-14 07:26:04.087+0000: Domain id=5 is tainted: high-privileges
2018-08-14 07:26:04.088+0000: Domain id=5 is tainted: host-cpu
2018-08-14T07:26:04.148959Z qemu-system-x86_64: -chardev pty,id=charserial0: char device redirected to /dev/pts/0