Linux on Apple devices
The Linux kernel can run on a variety of devices made by Apple, including devices where the unlocking of the bootloader is not possible with an official procedure, such as iPhones and iPads. iPad 
In June 2022, software developers Konrad Dybcio and Markuss Broks managed to run Linux kernel 5.18 on a iPad Air 2. The project made use of the Alpine Linux based Linux distribution called postmarketOS, which is primarily developed for Android devices. The developer suggested that they used the checkm8 exploit which was published back in 2019.

iPhone 
In 2008, Linux kernel 2.6 was ported to the iPhone 3G, iPhone (1st generation), and iPod Touch (1st generation) using OpeniBoot. Corellium's Project Sandcastle made it possible to run Android on an iPhone 7/7+ or an iPod Touch (7th generation) using the checkm8 exploit. iPod 

iPodLinux is a Linux distribution created specifically to run on Apple's iPod. Mac

Motorola 68k Macs 
Linux can be dual-booted on Macs that use Motorola 680x0 processors (only 68020 and higher, and only non-"EC" processor variants since an MMU is required). The Linux/mac68k community project provides resources to do so, and an m68k community port of the Debian Linux distribution is also available. PowerPC Macs 
PowerPC Macs can run Linux through both emulation and dual-booting ("bare metal"). The most popular PowerPC emulation tools for Mac OS/Mac OS X are Microsoft's Virtual PC, and the open-source QEMU. Linux dual-booting is achieved by partitioning the boot drive, installing the Yaboot bootloader onto the Linux partition, and selecting that Linux partition as the Startup Disk. This results in users being prompted to select whether they want to boot into Mac OS or Linux when the machine starts. By 2008, a number of major Linux distributions had official versions compatible with Mac PowerPC processors, including:

 Gentoo
 Debian (until Debian 8)
 Ubuntu (until Ubuntu 16.10)
 Fedora (until Fedora 17 for G3 and G4 processors, and Fedora 28 for G5)
 Yellow Dog Linux (discontinued in 2009)

All of the above PowerPC ports have since been discontinued, except for Gentoo. Intel Macs 
Macs with Intel processors can run Linux through virtualization or through dual-booting. Common virtualization tools for Intel Macs include VMware Fusion, Parallels Desktop, and VirtualBox. In 2010, Whitson Gordon from Lifehacker noted that Apple has streamlined the process of dual booting Windows on Macs, but not for Linux. rEFIt made it possible to dual boot Linux. Apple silicon Macs 
The Asahi Linux project is porting Linux to the M1 (and up) based SoCs. Asahi Linux is currently available as an incomplete preview. See also 
 iBoot
 Cydia
 MkLinux
 Linux range of use
 OtherOS
 Linux on IBM Z

References

External links 

 

Apple Inc.
Linux kernel