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I installed Ubuntu on a large and fast USB drive from a USB thumbdrive on a Mac. The point was to boot the drive by keeping "option" pressed down when starting the Mac, just like I did for the thumbdrive. But the Mac never sees the USB drive upon boot. It sees it once it's started and Ubuntu saw it during installation. I tried the bless command in sereval ways, but it didn't change anything.

During the installation, I asked for Grub to be installed at the root of the USB drive, which in my case was /dev/sda. There is an EFI partition of 200MB that I think is unused on the drive. I'm not sure what to do next. The thumbdrive boots to Ubuntu just by keeping "option" pressed down, so it must be possible.

eje211
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1 Answers1

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Actually, it turned out this was the answer I was looking for all along:

https://askubuntu.com/a/946155/13360

It took me a couple of hours to formulate the right thing to search for. But after I tried that, it worked on the first try.

I only had to do the first part, steps 1 to 14. After that, my Mac saw the drive and booted on it.

eje211
  • 131