I've just installed VirtualBox (version 5.0.14) and Ubuntu (14.04 LTS) in my Windows 7 (64 bits, Service Pack 1) desktop computer. Ubuntu works fine, however the screen size does not use 100 % of the computer screen.I mean a small Ubuntu screen was placed in the middle of the monitor, and actually I cannot reach some of the icons due to size screen limitation. Note: Under Ubuntu Settings/Display/Video tab I already configured 128 MB for the Video Memory. Also I use NVIDIA GeForce9200. Thanks.
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To set resolution as 1366x768 for example:
Go to C:\Program Files\Oracle\VirtualBox and run the following command, then restart virtual machine:
VBoxManage.exe setextradata global GUI/MaxGuestResolution 1366,768
This will set the resolution for all guest OS.

Andy W
- 11
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I actually looked it up and possibly found your answer here
cannot change screen size from 640x480 after 14.04 installation on VirtualBox OSX
All you need to do is update your virtual box Go to the terminal, type:
sudo apt-get install virtualbox-guest-dkms
restart the VM, and that should do