boot from Windows installation USB key.power on holding option/alt to open the Startup Manager.insert the Windows installation USB key.You can boot one OS using Startup Manager or via Boot Camp. create another partition, leaving 50GB for OS X partition Īt the end of this section, you will have a dual boot Mac: OS X and Windows 10.start UNetbootin and prepare also the second USB key for Ubuntu installation media.open BootCamp and prepare the first USB key for Windows installation media.download rEFInd Boot Manager and unpack it.download Ubuntu Linux 16.04 Desktop image.When installation is completed, consider to upgrade your OS X to latest version. open Disk Utility, select your main disk and press erase (do that more than once, if first attempt fails).keep pressing command + R while you power on your Mac (release when the apple disappear) and boot into macOS Recovery mode.If you have a OSX installed on a single partition, filling the whole disk, go to the next step below in this paragraph. I made lot of tests to make everything working fine, so be sure you follow the steps below carefully. 150GB for Ubuntu Linux 16.04, my preferred OS.I have a 250GB SSD, and I’m going to allocate: A virtual machine can help but what if you need to test policies against physical hardware? As a network and security architect, I sometimes need to test security and network policies using different OS.
