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I got and installed VirtualBox Guest Additions by running and then as root, but Slita still doesn't go full screen in Virtual Box running on Windows 7.

The max resolution is 800x600. I enabled 3d Acceleration in Settings too.

When installing Guest Additions I get

Execution return code: 2 ex000020b: Unknown Error

How to go full screen?

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You need to install the additions on the GUEST and then reboot the guest – bodhi.zazen Jan 22 '14 at 18:21
@Bodhi.zazen I did. It said everything was successful inside guest Slitaz. I rebooted it twice but nothing changes. I did just notice that I got a slightly higher resolution numbers available in Display Settings of the guest os but they are not native to my screen and are weird. Like this 943x623 – ThatAPlane Jan 22 '14 at 18:31
up vote 1 down vote accepted

You need to Install Guest Additions on the Virtual machine. A guide and more information can be found here.

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I don't have "Install Guest Additions..." option. Only "Insert Guest Additions CD image..." but nothing happens. If I try to mount the .iso with VirtualCloneDrive and install Additions I get an error with exit code of 2. – ThatAPlane Jan 22 '14 at 18:29
As soon as it start to install drivers I get the error that is. Error code ex000020b: Unknown Error – ThatAPlane Jan 22 '14 at 18:34
What version of VirtualBox are you using? – Geditdk Jan 22 '14 at 18:42
Actually I just ran again and rebooted Guest OS. Now Full Screen works fine. Weird. – ThatAPlane Jan 22 '14 at 18:47

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