You’ll see the default VDI storage location and size on the next screen, leave them as they are, and select Create.Choose Dynamically allocated and select Next.Choose VDI (VirtualBox Disk Image) and select Next. Next, you’ll need to choose the type of file you’d like to use for the virtual hard disk.Choose the Create a virtual hard disk now option and click Create. On the next screen, you’ll need to create a new hard disk for your virtual machine.You have two options to choose from you could either use Dynamically allocated storage which grows as you keep using the storage, or allocate a Fixed-size storage limit that offers faster performance. This portion will only be accessible to your virtual operating system, i.e., Ubuntu in this case. Click the litte disk right next to the Optical Drive SATA Port 1 and select your Windows. You will see the same screen as the screenshot below, go to Storage and click on the disk image.

You’ll also need to allocate a portion of your hard disk to the virtual machine. Click on Create and go to the settings of the VM. For instance, if you have 16GB total RAM, allocate 4GB to the virtual machine.

Ideally, you should choose to allocate about a fourth of your PC’s RAM.

Now that you have VirtualBox installed and Linux downloaded, its. Allocate Memory size to your virtual machine. You should end up with an ISO file in your Downloads folder.

Ubuntu iso for virtualbox windows 7