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I've just installed Ubuntu 14.04.3 in VirtualBox 5.0.14, and got the usual problem of only being able to get 640x480 screen resolution.

I ran sudo apt-get install virtualbox-guest-dkms, restarted virtual box; no change.

I ran Xdiagnose with all diagnostic options checked - now I have a choice of 640x480 and 1024x768. Well, that's better, but still not good enough.

I go to System Settings | Software & Updates | Additional drivers, and under InnoTek Systemberatung GmbH: VirtualBox Graphics Adapter select "Using x86 virtualisation solution-X11 guest utilities from virtual-guest-x11 (proprietary)" and click apply. The computer thinks about it for a few moments, then changes my selection back to "Do not use the device".

So what next? How do I get bigger screen sizes?

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The easiest way to install the guest additions (and I suspect that yours are not installed correctly) is to run:

sudo apt-get install virtualbox-guest-additions-iso

Then install from:

Device -> Install Guest Additions

on the VirtualBox running as guest. Newer versions of VirtualBox will actually differ slightly:

Device -> Insert Guest Additions CD Image...

If the installer cannot find the iso it is here: /usr/share/virtualbox/VBoxGuestAdditions.iso.

Reference:

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