Help needed for old mac

need guide to install on old macbock air from 2013 ?

can you check theses points :

  1. if you still have version before 10.7 , you can boot on USB iso ,
    with Option ( ALT) pressed at start
  2. before 10.7 , you can still format your disk in GPT in one partition , and keep partition driver
  3. ** do not bless any other system os x ** , as it will always start to find theses osx boot partitions.
  4. install with Grub , and after always boot with Alt to see partition /boot/esp linux appears

if this after 10.7 or more , or if you dont have any more a HFS+ partition , it will be not easy , because , you have the recover partition , and you can ONLY bless an os X partition …

for create usb Iso you can use dd command , beware to always check BEFORE disks and point mounts (dev/sdX )

fisrt check return

sudo diskutil

see this video

just be careful on this point :
there is 2 types of install linux , with or without secureboot ,

  • with secureboot ( like unbuntu / debian / fedora / … ) they use a shim key micro$soft for that
  • without secureboot ( Cachyos / endaevouros , Archlinux , and many others) , you have to boot with option ( alt) each time ti see and select boot efi.

** do not format /boot/efi disk or recover, always add as mountpoint **