
Introduction
VirtualBox allows you to run an entire operating system inside another operating system. Please be aware that you should have a minimum of 512 MB of RAM. 1 GB of RAM or more is recommended.
Comparison to Dual-Boot
Many websites (including the one you're reading) have tutorials on
setting up dual-boots between Windows and Ubuntu. A dual-boot allows
you, at boot time, to decide which operating system you want to use.
Installing Ubuntu ...