We then have the following options we may try the follwing: Older versions of Virtual Box may be incompatible with either the graphics drivers from the host, or with the guest Ubuntu version. In case this fails we may try to reinstall guest additions, and watch out for errors we may get when doing so. In case we have no functioning GUI we may install the guest additions from command line.How do I install Guest Additions in a VirtualBox VM?. To be able to scale the screen geometry, and to enable fullscreen mode of a Virtual Box guest Ubuntu we need to install the guest additions:
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