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Linux Mint on a Macbook Air 2013 11 inch
This is how I installed Linux Mint on my old MacBook Air 2013 11 inch laptop. I ran into some issues that are important to consider and correct.
I followed the Linux Mint Tutorial. For this I downloaded the latest Linux Mint version and used Etcher on Windows.
To boot with the Live USB, click the Option (Alt) key while booting. From there I ran into the first issue. When you but Live Linux Mint, and try to install it, it didn't find the harddrive. I found that the issue has to do with Intel Virtualization On in Linux. So first, when booting using the Live Linux Mint, during the bootloader you have to click e then insert intel_iommu=off right before the --. Then click F10 or in my case the volume down key. After that it will load the Live Linux Mint and then you can install Linux Mint on the right HDD.
When I tried to boot after instalation, it went right to BusyBox, telling me something was wrong. The error I forgot to save, but the Internet said it was because the laptop was trying to boot using the USB.
So I again booted using the Live Linux Mint USB, and make sure to use the intel fix again otherwise it won't work.
We need WiFi for this and you will notice it doesn't have. If you have ethernet, you can use it. What I did was to use Device Manager and install the Broadcomm Drivers. After that, connected to my WiFi.
Inside, go to Adminitration>Boot Repairand run the Standard repair. It should appear, otherwise, it means it didn't find the harddrive again.
After the repair, reboot. It will say Ubuntu in the Bootloader, no matter. And then it won't boot again, it will go to BusyBox with another error.
To fix this last part, we need to make sure it recognizes the hard drive, and the only way to do it is turning off Intel Virtualization. For this, once you are in the boot loader and it says Ubuntu, click e for emacs and add intel_iommu=off in the line where it says linux at the end after it says quite and splash. Then click F10 again. It will boot fine, but we need to make a permanent change to Grub.
Once it boots correctly, install WiFi again as before, because we only did it in the live USB. Then go to the terminal and sudo nano /etc/default/grub. Add the line intel_iommu=off on the GRUB_CMDLINE_LINUX_DEFAULT line, inside the quotes and right after quite splash.
Save the file with nano and finally update Grub
sudo update-grub
After that, boot again and it should now boot normally.
Enjoy!