Lubuntu is a fast and lightweight operating system with a clean and easy-to-use user interface. It is a Linux system, that uses the minimal desktop LXDE, and a selection of light applications. Because of this, Lubuntu has very low hardware requirements. Lubuntu was founded by Mario Behling and has been grown for many years by Julien Lavergne.

Setup Virtual Box
Download and install VirtualBox from https://www.virtualbox.org/.

Enable Hardware Virtualization
Make sure that hardware virtualization extensions are enabled in your BIOS. Otherwise only 32 bit images are supported in VirtualBox. In order to enable hardware virtualization you have to restart your PC/Laptop and view the BIOS settings at startup.

Download Lubuntu Linux Image
Next step is to install a guest operating system. You can install any Linux variant using VirtualBox. My preferred image is Lubuntu 16.04.3 LTS. Download the iso image from https://lubuntu.me/downloads/.

Open Virtual Box application and click on ‘New’

Give a name for the guest os, select Linux as the type and Version as Ubuntu (64-bit). Click on Next

Provide a minimum 2.5 GB RAM for the OS. Click on Next

Choose option ‘Create a virtual hard disk now’ from the Hard disk options. Click on Create.

Choose ‘VDI (VirtualBox Disk Image) as Hard disk file type and click on Next

Choose dynamically allocated hard disk and click on Next

Give at least 25GB space for VDI and click on Create
Here you can also specify a folder location on which VDI is created. By default it creates VDI in user profile space.

Double click on the image in the left navigation pane

Browse and select the iso image and click on start

Press Enter in next screen

Choose ‘Install Lubuntu’ and press Enter on next screen

Choose language and Click on Continue

Check updates if you have internet connection and click on Continue

Choose ‘Erase disk and Install Lubuntu’ and click on ‘Install Now’

Click on Continue

Choose the timezone and click on Continue

Choose Keyboard layout and click on ‘Continue’

Give a user name and password and click on Continue

Installation begins and wait for it to complete

Click on ‘Restart Now’ after installation completes