One of the simplest apps for this is balenaEtcher, but you can use anything you like. You need to use a third-party app to create a USB installer from the Ubuntu disk image. Step 3: Create an Ubuntu USB Installerĭownload the latest version of Ubuntuas a disk image from the Ubuntu website. If it doesn't, hold Optionswhile booting up to load your boot manager. Next time you restart your Mac, the rEFInd menu should appear automatically. After the installation, remember to enable SIP again.When prompted, enter your administrator password and press Enter again.Drag the refind-installfile into your Terminal window and press Enter.open Finderin a separate window and navigate to the rEFInddownload.With SIP disabled, open Terminalfrom the Utilities folder in Applications (or search for it using Spotlight).This is an important security feature for macOS, so make sure you enable it again after. To install rEFInd, you need to temporarily disable System Integrity Protection. Thus, your next step is to download rEFInd, which is the boot manager we recommend. This means you need to install a third-party boot manager instead, which will let you easily choose between macOS or Linux when you start up your computer. The standard boot manager on your Mac doesn't always work with Ubuntu. go to System Preferences > Security & Privacy > FileVaultto turn it off. If you can't create new partitions, it could be because FileVault is encrypting your hard drive. This might be something like 4GB, 8GB, or more. Make the size match the amount of RAM in your Mac. Name this partition SWAPand set the format to MS-DOS (FAT)again. Repeat the steps above to create another partition.

Give it as much space as you want to use for Linux.

name it UBUNTUand set the format to MS-DOS (FAT32).

use the Plusbutton to create a new partition.

Select the highest-level drive for your Mac hard disk, then click partition.

In the top-left corner, select View > Show All Devices.

open DiskUtilityfrom the Utilities folder in your Applications, or search for it via Spotlight.

Use Disk Utility to create new partitions on your Mac:

How to dual boot mac and linux