Windows 10.qcow2 Download -

| Problem | Solution | |---------|----------| | "No bootable device" after download | Your qcow2 lacks VirtIO drivers. Add a second disk with virtio-win.iso and boot from installation media to repair. | | Blue screen: INACCESSIBLE_BOOT_DEVICE | Same as above. Change disk bus from VirtIO to IDE in VM settings (temporary fix). | | Very slow performance | Ensure KVM acceleration is on (lsmod \| grep kvm). Add -accel kvm -cpu host. | | Network not working | Install VirtIO Ethernet drivers from the guest tools ISO. | | Mouse jumps / screen flickers | Install SPICE guest tools (spice-guest-tools.exe). Use -vga qxl and -spice port=5900,disable-ticketing. | | The qcow2 file is 30GB but my disk is only 50GB | qcow2 is sparse. Use qemu-img info Windows10.qcow2 to see actual disk usage (disk size vs virtual size). |

qemu-system-x86_64 \
  -enable-kvm \
  -cpu host \
  -smp 4 \
  -m 4096 \
  -drive file=windows10.qcow2,if=virtio \
  -cdrom Win10_22H2_English.iso \
  -drive file=virtio-win.iso,index=1,media=cdrom \
  -net nic -net user \
  -vga qxl