We then should be able to resize or scale the guest screen, or enter full screen mode with Host + F.Īlso see Adjusting display geometry in a virtual machine? for additional options to adjust screen geometry. In rare cases we may have a better performance with an older Ubuntu release, or a more lightweight derivate such as Lubuntu, or Xubuntu.Īfter having installed the guest additions the guest OS needs a reboot for the virtual driver to be loaded. Update the guest operation system from command line (hold left Shift key on booting to enter a root shell) and then run: apt-get update & apt-get dist-upgrade How do I install the VirtualBox version from Oracle to install an Extension Pack? Make sure we have 3D-acceleration enabled in the virtual machine settings, and allow enough of video memory: 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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