Learn how to install free virtualization software like VMware player or Sun VirtualBox in Ubuntu, so you can run Windows, Fedora, or any other operating system on top of Ubuntu in an isolated Windows in a virtual environment without the need to repartition your hard drive. You can also run multiple operating systems at the same time to save money and time when multi-tasking on your computer.

Install VirtualBox in Ubuntu Linux 10.04 LTS video
I'll teach you how to install Oracle Virtual Box 3.2 onto Ubuntu Linux 10.04 LTS from the Gdebi package installer in this video.

Use Ubuntu10.04 Live CD ISO to recover files on a Broken VirtualBox Virtual Machine
I'll show you how to simply use Ubuntu 10.04 Install CD to recover your files to a USB flash drive or another virtual drive from a virtual machine which won't boot.

Install Ubuntu Linux 10.04 LTS on Oracle Virtual Box video
I'll show you how to install Ubuntu 10.04 on Oracle's VirtualBox software. Also, learn how to install Virtualbox guest additions for improve useability. Plus, learn to install Adobe flash player to watch Youtube videos.

How to install Virtual Guest Additions for Ubuntu 9.10 and other linux Distro Video.
Learn how to install Virtual Guest Additions for Sun VirtualBox for impove monitor resolutions, performance, and mouse capturing capabilities in VirtualBox.

Install Sun VirtualBox on Ubuntu 9.04
Learn how to Install Sun VirtualBox on Ubuntu 9.04, so you can run Windows XP, Fedora, and other OS within Ubuntu without the need to restart, repartition hard drives, or risk losing your files.

Install and update Ubuntu 9.10 in Virtual Box virtualization + Learn how to install Flash video. 
Learn how to install+update Ubuntu 9.10 in Virtualbox which is available for Windows, Mac, Linux, and Solaris. Also, learn how to install how flash player in Ubuntu 9.10 and below

Install and use VMware on Ubuntu 9.04
Learn how to install VMware Player on Ubuntu 9.04 with the .bundle install file in Terminal Command Prompt, and learn how to install and run a Virtual Machine in VMware with .vmx virtual machine files for VMware Player.

Installing and uninstalling programs with Ubuntu Software Centre for Ubuntu 9.10 (I teach you how to install Virtual Machine Manager in this tutorial)
Learn how to install and uninstall programs in Ubuntu with Ubuntu Software Centre for Ubuntu 9.10.