Virtual Box is a open source hosted hyper visor for PCs developed Oracle it handles running multiple operating systems simultaneously.
You have Windows operating system but you want to Ubuntu but you don’t need along side with your windows so first install Virtual box after that will go with Ubuntu iso installation.
How to Install Ubuntu on Virtual Box Simple Steps for beginners
Step 1: Open Virtual Box and Click on New button.
Step 2: Enter your operating System Name dependents upon Ubuntu/Linux or Fedora your operating system
Step 3: Select your Memory size depends on your machine Hard Disk.
Step 4: After that Click on Create a Virtual hard disk
Step 5: Choose your option whether your file belongs whether Image file or Disk file
Step 6 : Storage on Physical hard disk select Dynamically allocated because some times Fixed size is not comfortable
Step 7: Select File location and Size for per your requirement
Step 8: Right click on your Ubuntu/Linux image then will go with start
Step 9: After that start button click on Normal Start
Step 10: Browse your Ubuntu iso file
Step 11: If you need any changes press F12 boot device other wise leave it
Step 13: Loading ISO file
Step 14: Click on Install Ubuntu will go with next steps
Step 15: Check the “Erase disk and Install Ubuntu in Virtual Box.
Step 16: Create User name and Password
Step 17: After Installation Complete Restart Now
Step 18: Enter your Password
Step 19: Successfully completed Ubuntu\Linux on Virtual Box
Step 20: If you want to close your Virtual Machine click on Power off the machine
In this video explain how to install Ubuntu along side Windows on Virtual Box simple steps :
Virtual Box now a days more popular because it is open source software and installed many hosts depends upon your machine and it uses without any risk and incredible reliable and run it simple.