I tried all possible paths,

  • set root (hd1)...' for all hdX
  • chainloader +1
  • boot

All i get is error: "cant find command line root" I have no experience with grub, and I just want to install ubuntu on an old macbook pro (overwrite whole thing) please teach me (been hours)

1 Answer 1


An alternative way to try to boot to the USB is to restart the computer and hold down the option key.

You should see a row of icons representing the bootable devices found, the USB would be an orange one with a USB logo on it, if it shows. Hopefully it does because then just highlight it and click the arrow underneath (or press enter).

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