Create guest VM fullscreen inside VirtualBox

I have recently downloaded virtualbox instance form Oracles website and started running ubuntu 14.04 as guest machine om the same. However guest machine do not resizes when we resize the VMWare window. Some googling and it seems I need to install guest extension packges. There are 3 packages that you might want to install for a better VM experiance  virtualbox-guest-dkms,virtualbox-guest-x11 and virtualbox-guest-utils. To install them follow below command inside a VM

sudo apt-get install virtualbox-guest-dkms virtualbox-guest-utils virtualbox-guest-x11

Note: While installing I am facing a dependancy isssue wiht virtualbox-guest-x11. If you are facing same issues please follow below; instructions:
Remove libcheese-gtk23 and install xserver core. Removing libcheese-gtk23 will take 5-10 mins. So be patient.

sudo apt-get remove libcheese-gtk23
sudo apt-get install xserver-xorg-core

and finally intall x11 guest extension;

sudo apt-get install -f virtualbox-guest-x11