if you’ve upgraded virtualbox and afterwards you can’t start the vm’s, because of the error ‘the device helper structure has changed’, you must reinstall/update your virtualbox extension pack. Run as root the following command: vboxmanage extpack install –replace ‘new-extpack-file’
Error message: Kernel driver not installed (rc=-1908) The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. Please reinstall virtualbox-dkms package and load the kernel module by executing ‘modprobe vboxdrv’ as root. … Continued
Use the following Virtualbox command in your shell: (you must specifiy the target size in MB, for example 200 GB = 200000) VBoxManage modifymedium image.vdi –resize 200000 tested with: Virtualbox Version 5.0.24_Debian
Use the following Virtualbox command in your shell: VBoxManage clonehd old-file.vmdk converted-file.vdi –format VDI tested with: Virtualbox Version 5.0.24_Debian