Re: Install Debian 10 amd64 onto USB flash drive with and for Macintosh

[Dan Ritter <dsr@randomstring.org>]

David Christensen wrote: 
> debian-user:
> 
> I have an Apple MacBook Pro (Retina, 15-inch, Mid 2015) with an Intel Core
> i7-4770HQ processor, 16 GB memory, and 256 GB SSD:
> 
> 
> If I now power up the machine with the buster-mac USB flash drive installed,
> Debian starts.
> 
> 
> 
> If I now power up the machine without the buster-mac USB flash drive
> installed and hold the Option key, I see the MacBook firmware disk window
> showing the internal SSD.  Selecting the internal SSD starts macOS.
> 
> 
> If I now power up the machine without the buster-mac USB flash drive
> installed and hold the Command-R keys, I see the MacBook firmware POST
> screen, then the MacBook firmware utilities window.  Selecting Disk Utility
> and View -> Show All Devices, I see:

I am pretty sure you didn't want to install GRUB at all -- the
Mac's own EFI booter should work on your USB stick; it's invoked
by holding down option at boot time.

-dsr-