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I've been struggling for a bit on this. I've installed Ubuntu on my external SSD with the following Partition:

  • 200MB EFI boot partition
  • 1GB ext2, mount to /boot
  • Swap
  • Ext4

I did the installation from my Windows machine and it works.

Now, I want to run Ubuntu on both my Mac and Windows, but I am struggling to get Ubuntu to load on the Mac. I installed reFind on my SSD. However, when I load Ubuntu I keep getting this:

"a start job is running for dev-disk-by x2duuid"

Any idea on how I can get past this?

Thanks for the help!

  • 1
    Did you copy /EFI/ubuntu from PC's internal drive to external SSD's ESP - efi system partition. You have to copy twice, once to /EFI/ubuntu & again to /EFI/Boot and rename shimx64.efi to bootx64.efi. That is because UEFI only boots from /EFI/Boot/bootx64.efi on external drives, but copy of shim or grub expects more files in /EFI/ubuntu. It probably only works on PC as you have installed grub to internal drive. – oldfred Jan 13 at 4:32

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