Using VNC with Ubuntu on VirtualBox

1. Create an Ubuntu 64 bit VM on VirtualBox with following specs:
1. CPU - 1
2. Memory - 1GB
3. HDD - 20GB (VDI, Dynamic allocation)
4. Network - NAT with Port forwarding - TCP, 5900 (on local host) forwarded to 5900 (on VM)
2. Download Ubuntu desktop 15.04 and install it on the VM.
3. Once installation completes, search for Desktop Sharing applet. 
4. Enable sharing, provide password.
5. Now launch a VNC viewer and specify the IP of the parent host on which VirtualBox is installed with port 5900.
1. If connecting from same host where virtual box is installed then you may use localhost:5900. 
6. It will prompt for password then connect.