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I'm trying to install Ubuntu on the virtual box using USB. My primary OS is also Ubuntu. When I'm booting, it's giving me this problem: screenshot

So, I'm trying to find a way to resize the storage. I came across this command: VBoxManage modifyhd YOUR_HARD_DISK.vdi --resize SIZE_IN_MB , but this only works if the image extension is vdi.

In my system, under Virtual box image folder, it's shows Ubuntu.vbox instead of Ubuntu.vdi.

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The .vbox is an xml file describing the properties of the VM, not the virtual hard drive.
In the .vbox file you can find the Virtual hard drive properties in the HardDisks sections. You can also find the virtual Hard drive properties (including file name and location) in the VirtualBox GUI showing the VM properties.

Available Virtual hard drive extensions are : VDI|VMDK|VHD
Only VDI and VHD can be resized (expanded)

- Open virtualbox gui
- Display the Virtual media manager CTRL+D
- Find you virtual Hard Drive
-- If it is a VDI or VHD file you can resize it with a command like that:
vboxmanage modifymedium --resize <newSizeInMegabytes> /path/to/file.vdi
-- If it is VMDK file, you will have to create a new Virtual hard drive file or clone the existing and change the file type.
You can do both from the VirtualBox media manager or from CLI with vboxmanage. And then attach the new drive to the VM.

Get more information:
https://www.virtualbox.org/manual/ch08.html#vboxmanage-createmedium

  • Thanks for clearing my vbox doubt :) – Sukhdeep Jul 20 at 6:42
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After posting this question, I researched more and thanks to this answer, I understood the difference of vdi and vbox.

If someone is stuck with the storage issue while booting from USB, and you've made a vmdk extension file e.g. usb.vmdk, create an iso instead of vmdk file from the bootable USB.

This answer will help you to create iso from bootable usb.

dd if=/dev/sdc of=myusbkey.iso

You have to replace the sdc with your usb disk name. You can find out that by using: sudo lsblk

The original answer that helped me is this.

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