I do not know the specific instructions for Macbooks. The general ones are
behind this link:
https://trisquel.info/en/wiki/starting-installable-live-system
- [Trisquel-users] Touchbar Macbook Pro and Trisquel 9 davidpgil
- [Trisquel-users] Re : Touchbar Macbook Pro and Trisquel 9 lcerf
- Re: [Trisquel-users] Touchbar Macbook Pro and Trisquel 9 enduzzer