How to Dual Boot Mac and Linux: A Simple UEFI Guide (October 2026)

Dual booting a Mac and Linux means installing a Linux distribution alongside macOS on the same drive, then picking which one to boot each time you switch the machine on. How you do it depends almost entirely on one thing: whether your Mac runs on Intel processors or Apple silicon. Intel Macs boot a standard Linux installer from a USB stick. Apple silicon Macs need Asahi Linux, a port that is still incomplete, and on the newest M-series hardware it is not officially supported at all.

This guide walks through how to dual boot Mac and Linux on both kinds of hardware, plus what to do when things go wrong. It was last checked in October 2026 against current distribution instructions, because most of the guides still ranking for this question were written before Apple silicon existed.

What You Need

Before anything else, confirm your Mac type and check that a Linux distribution officially supports it. Supporting a machine as an enthusiast is not the same as a distribution saying it works there.

Which path applies to your Mac

Your Mac	How Linux gets installed	Space needed	Difficulty	Reversible?
Intel Mac, no T2 chip (roughly 2006 to 2017 models)	Standard Linux installer from a USB stick	30 GB minimum, 100 GB comfortable	Moderate	Yes, if you left macOS untouched
Intel Mac with a T2 security chip (2018 Macs onward)	Installer with reduced security, plus T2Linux for drivers	30 GB minimum	Hard	Yes, but macOS may need a reinstall
Apple silicon Mac (M1, M2)	Asahi Linux via the alx.sh installer	80 to 100 GB free	Moderate	Yes, through Disk Utility
Any Mac	Virtual machine or an external SSD, no partitioning	32 GB on an external drive	Low	Fully

What else to have ready

• A compatible Mac, confirmed with the check in the first step below.
• A Linux distribution and version, downloaded from the project’s own site rather than a third-party mirror.
• An empty USB drive of at least 8 GB. It gets erased completely.
• A full backup. Time Machine on an external drive is the least painful option.
• A USB hub for some older Macs with limited USB port availability.
• About an hour for Intel Macs, two to three hours if something goes wrong.

How much space you actually have

Base-model 128 GB and 256 GB Macs are the tightest case. A usable Linux install wants 30 GB as a bare floor and 100 GB to stop resizing your disk every few months. On a 128 GB machine that is not realistic alongside macOS, which is one reason the community generally pushes people toward an external SSD or a virtual machine instead.

There is also the size of the backup itself. Before you partition anything, your backup needs somewhere to live that is not the disk you are about to change.

Step-by-Step

1. Check Whether Your Mac Can Run Linux

Intel and Apple silicon Macs need completely different approaches, and using the wrong one wastes an afternoon. Start by identifying which you have.

Click the Apple menu, then About This Mac. Macs with an Intel processor list a model identifier and an “Intel” chip line. Macs with Apple silicon show “Apple M1”, “Apple M2”, “M3” or similar, with no model identifier field.

Next, check for the T2 security chip, which matters on Intel Macs. Shut the Mac down, hold the Option key, then power the Mac on. A Startup Security Utility screen appears. From there you can see the boot policy and, in System Information, whether a T2 is present. Alternatively, hold Option and choose Apple menu, then System Information, and read the Controller section: T2 Macs list an “Apple T2 Security Chip” there.

Check your macOS version too, from About This Mac. Asahi Linux requires a recent macOS release, and newer installers expect a current one.

Finally, confirm support before you download anything. Read the distribution’s compatibility notes. For Apple silicon, that means the Asahi Linux site. For T2 Macs, look at the T2Linux project documentation. If your exact model is not listed as supported, stop there and use a virtual machine instead.

One warning worth taking seriously: users on r/AsahiLinux have reported that installing Asahi on unsupported newer Macs corrupted the bootloader badly enough that the machine would no longer start. That is a rare outcome, but it is exactly the failure a support check is meant to prevent.

2. Back Up macOS and Prepare a USB Installer

Back up first, every time, even if you are only confident. Plug in an external drive, open Time Machine from the Apple menu, and let it finish. Verify the backup completed before you continue. Changing a partition table is the one part of this process that is genuinely hard to undo.

If FileVault is on, turn it off temporarily in System Settings, Privacy and Security, FileVault. A locked volume can complicate partitioning and you will want the data readable from Linux later anyway.

Download the Linux ISO from the distribution’s official download page. If the project publishes checksums, download the checksum file too and compare it before writing the image.

Write the image to your USB drive. On a Mac, install BalenaEtcher, choose the ISO file, choose the USB drive, and click Flash. Double-check that you selected the USB drive and not another disk.

Then check the stick before you rely on it. On Apple’s own community forums, one of the most common threads involves a USB stick that became unreadable after flashing with Etcher, even after reformatting. Before you reboot, open Disk Utility in Applications, Utilities, and confirm the drive appears with a Linux partition and a readable name. If it does not, re-flash it, try a different brand of drive, or flash the image from another computer.

3. Decide How to Make Space for Linux

You have three options and they are not equally risky. Using free space inside the existing macOS partition is the normal path. Booting Linux from an external SSD touches nothing on the internal drive and is the one I would suggest if macOS is your main system. Creating a separate partition is a middle ground that mostly exists on Intel Macs.

Here is the gotcha that stops most people. Modern macOS uses APFS, and in Disk Utility you must click View, then Show All Devices, to see individual volumes instead of just the container. Clicking Show All Devices and then selecting the top-level entry is what reveals the Partition button. Without that toggle the button stays greyed out and it looks like the feature is missing.

Once you can see the partition button, select the macOS volume and click Partition. Add a new entry with the Partition Scheme set to MS-DOS (FAT). That creates an empty partition of the size you want, typically 40 GB or more, which the Linux installer will use later.

APFS does not resize freely the way older macOS volumes did. Most of the reclaimable space has to be either free space inside the container or a container split, and neither is something to attempt casually. If the Partition button refuses to give you what you need, stop and use the external drive route instead of forcing it.

4. Install Linux From the USB Drive

Restart the Mac and hold the Option key the entire time until the startup manager appears. Choose the USB drive and press Enter. On Apple silicon, hold the power button instead until startup options appear, then pick the USB drive.

On an Intel Mac with a T2 chip, you may not reach the installer at all if Secure Boot is blocking it. Restart and hold Command, Option and R together to open Startup Security Utility, set Security Boot to No Security, and confirm. If that still fails, the reduced security option with Allow booting on external storage is the next thing to try. Some T2 users report the USB drive simply not appearing in bootable devices; disabling security fully is usually what unblocks it.

In the installer, choose manual partitioning, labelled “Something else”, “Install alongside”, or “Custom”. Manual partitioning is the only option that lets you confirm your disk is untouched.

Select the MS-DOS (FAT) partition you created, delete it to turn it into free space, then create the Linux partitions inside it. A typical layout is an ext4 root partition taking most of the space, a swap area or swap partition taking an amount equal to your RAM, and optionally a home partition for your files.

Leave the small EFI partition alone, the one roughly 200 MB in size. That is where your boot entries live. Point the installer at it if it asks which partition to use for boot, or let the installer handle it and fix boot entries afterwards.

Tick the third-party software or network driver option if the installer offers it. Without it, Wi-Fi usually will not work in the live session, which means no updates during install.

5. Install the Boot Manager and Test Both Systems

Once Linux boots to a desktop, the distribution’s own bootloader is often enough. Restart and hold Option to confirm both macOS and Linux appear in the startup manager before changing anything else.

If you would rather have a graphical boot picker than hold Option every time, install rEFInd from a Linux live session. It writes itself to the EFI partition and gives you a menu with icons. rEFInd requires System Integrity Protection to be relaxed first, which you do from macOS Recovery: hold Command and R, open Terminal, and run csrutil disable. On modern macOS, full security requires the Startup Security Utility instead, where reduced security covers this case.

Whichever route you take, test both systems at least twice before you move files around or resize anything. A working boot menu on the first try is worth a lot more than a working one after three restore cycles.

How to Dual Boot Mac and Linux After Installation

Daily use is simple once both entries exist. On an Intel Mac, hold Option at power-on and pick macOS or Linux. On Apple silicon, hold the power button until the startup options screen appears, then select.

Do not change the startup disk setting in System Settings, General, Startup Disk casually. Setting Linux as default can hide macOS from a plain reboot, which panics a lot of new users. Pick the system from the boot picker every time instead.

Sharing files works but takes a small setup. Modern macOS uses APFS, which Linux can read but not write by default. If you created an HFS Plus or exFAT partition for sharing during the install, it mounts directly. If you rely on the macOS volume, install hfsprogs and, on older setups, the CoreStorage revert first.

If a Linux entry disappears, boot macOS and confirm the EFI partition still lists both. You can reinstall the bootloader from a Linux live USB using the installer’s boot repair option, which is usually faster than reinstalling.

Common Mistakes

USB drive will not boot. Confirm you wrote the image to the drive and not to a file on it, and try a different port. On newer Macs, the port matters: a drive that is recognised in Disk Utility but never shows up at boot is often a hub or cable issue.

The USB stick is unreadable after Etcher. Reformat it in Disk Utility as exFAT and re-flash. If it still will not mount, the drive itself is probably the problem, and these failures show up more often with cheap drives than reliable ones.

Linux does not appear in the boot menu. Hold Option to get the full startup manager rather than relying on the default boot. If it is missing there too, boot macOS and check that the EFI partition was not overwritten, then repair the bootloader from a Linux live USB.

Disk Utility will not let me partition. You are almost certainly looking at the APFS container instead of the individual volume. Click View, then Show All Devices, select the top-level container row and its macOS volume, and try again. If APFS still refuses to shrink, use an external drive.

Installer crashes or the screen freezes. Common on T2 Macs with a mismatched kernel. Try a different distribution version, or boot with the nomodeset option added to the boot parameters.

Wi-Fi, keyboard backlight or trackpad stop working immediately after install. Expect this on T2 Macs with stock distributions; Linux Mint and Zorin are both reported as failing on first boot there. T2Linux exists specifically to add the missing drivers, and the pommed daemon handles backlight and volume hotkeys.

The CPU fan spins constantly. This is an ACPI interrupt quirk on some Mac models, fixed by disabling the ACPI GPE16 interrupt through a kernel parameter.

macOS disappears entirely. Rare, and usually means the EFI partition was damaged. Hold Command and R on an Intel Mac to boot into macOS Recovery, then reinstall macOS from there. A working Time Machine backup makes this a restore rather than a reinstall.

How to undo the whole thing. On an Intel Mac, boot macOS, open Disk Utility, erase the Linux partitions to free space, and delete the extra MS-DOS (FAT) partition. On Apple silicon, remove the Asahi volumes and reset the boot entry from Recovery. Keep macOS on the internal drive and the change reverses cleanly. If your concern is that partitioning will leave you with a Mac that cannot boot, this is the section to read before you start.

Frequently Asked Questions

What to Do First

Check your Mac type. Intel, T2 or Apple silicon decides the whole route, and getting it wrong is the step people regret.

Then confirm the distribution supports your exact model before you download anything. If it does not, stop and use a virtual machine.

Finally, finish the Time Machine backup and verify the USB stick mounts in Disk Utility after flashing. Those two checks take twenty minutes and prevent almost every failure described above.