convert img format to vdi format virtualbox

 for convert img format os to virtualbox format :

command fo linux terminal :

"qemu-img convert -f raw -O vdi openwrt-21.02.3-x86-generic-generic-ext4-combined.img openwrt-21.02.3.vdi"

ref:

https://docs.openstack.org/id/image-guide/convert-images.html