boot el capitan iso virtualbox no bootable medium found

Now you must include/select this file as the virtual hard disk/ medium file as shown in the answers above. This file is also used if you actually want to install the particular OS on your PC/laptop.

This file can be found on the website of the OS you want, and must be downloaded. An external file called the ISO or system image file is needed.This is the 'bootable medium ' referenced above. When you install VirtualBox, it does not automatically come with the ability to run all the listed operatings systems (as I used to think ). Then select the iso file and click Choose. the 'Windows.iso' file in this example) 4. Click Add and open the bootable ISO file with the OS that you want to install (e.g. Click the 1st plus (+) button next to Controller to add optical drive. So I will try to answer it as simply as possible, for anyone in my position :- Open the Settings of the VirtualBox machine and go to Storage. Primarily because Ubuntu had been installed on my PC by a friend, and I had zero experience there. I remember it taking me a while even after reading them. Although I have accepted the answers above, I realize that from the point of view of a complete noob to linux and operating systems in general, the concept of images ,ISO files etc is still confusing.

Boot el capitan iso virtualbox no bootable medium found