added missing modprobe for nbd

README.md

@@ -27,6 +27,7 @@ vi config.sh
 #### Qemu disk as installation target
 To prepare a qemu disk as installation target run following commands and set `disk=/dev/nbd0` in `config.sh`:
 ```
+if ! lsmod | grep -q nbd; then sudo modprobe nbd max_part=8; fi # load nbd if missing
 img="/var/lib/libvirt/images/ts-linux-testing.qcow2"
 qemu-img create -f qcow2 -o size=20G $img  # create image
 chown libvirt-qemu:libvirt-qemu $img       # make accessable for qemu