I have installed Ubuntu 18.04 on VirtualBox and the display is not covering the whole screen of the guest OS.
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Guest Additions is an image of a CD. It needs to be connected as a device to the VM and then launched from inside the Ubuntu guest OS.
From the VirtualBox client menu, choose Devices → Insert guest additions CD image. It will mount into Ubuntu. Once it does, run the installer from that CD/DVD image and reboot the system once it's installed.
That should allow your guest OS to resize itself properly.
BeastOfCaerbannog
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Phillip H. Blanton
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If you are talking about the VirtualBox window, you can go to View → Switch to Fullscreen Mode.
See this thread: Is there a way to make a fullscreen on VirtualBox?
BeastOfCaerbannog
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Saxtheowl
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