I have just installed Ubuntu 14.04 on VirtualBox, including the guest additions.
However, the display is really slow. Looking at the display settings I can see that the video memory is only 12MB but I can't move the slider to increase it. The checkboxes for extended features are greyed-out too. See screenshot.
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How do I increase the amount of memory?
TIA
Best Answer
You need to shut down the virtual OS before you can edit settings.