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Convert a VirtualBox VDI to KVM QCOW2 format with qemu-img

qemu-img convert -f vdi -O qcow2 [VBOX-IMAGE.vdi] [KVM-IMAGE.qcow2]

Uses qemu-img to convert a VirtualBox disk image ([VBOX-IMAGE.vdi]) into the KVM-compatible QCOW2 format ([KVM-IMAGE.qcow2]), enabling the image to be used with KVM/QEMU virtual machines.

virtualization [kb:65]