How do I increase VirtualBox resolution past 800x600 in Linux? [duplicate]

How do I increase VirtualBox resolution past 800x600 in Linux? [duplicate] No matter what I do I cannot get the resolution past 800x600. If I am using a Windows install in VirtualBox, I can get it to 1024x768.
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bert [Entry]

"Have you installed the VirtualBox Guest Additions on your guest yet? If so, then the size of the guest should reflect the size of your VirtualBox window, so if you maximise the latter, your guest should resize its display accordingly.

You may also need to activate VirtualBox's Auto-resize Guest Display option (Host-G is a hot key for that)."