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Once the installation finishes, ignore any warnings or errors and resize your virtual machine window to complete the installation of the operating system.A terminal window will open and the installation will begin.Go to "Devices" -> "Insert Guest Additions CD image.".Start the virtual machine and boot into your installation image.
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The solution was to add an additional optical drive to the virtual machine, which allows the guest additions image to mount after booting into the installation image.
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