I am installing Ubuntu (latest version 64 bits) on Macbook Pro 2015. Before Ubuntu, I have already installed Win 10 using bootcamp, and I am installing Ubuntu on an external hard-drive. At the Ubuntu installation page, I have clicked install boot-loader to the external hard-drive (/dev/Sdb) as well.

But here comes the problem. Every time when I start my Macbook after a shutdown, it will automatically going into the GNU Grub command line.

If I do grub>exit, then it will boot into Mac-OS.

If I hold "Alt option" key during boot-up, I will see only two systems: Mac and Windows. No Ubuntu.

I have to select Windows and then select Ubuntu in order to get into the linux system. The boot-loader setup must have been messed up. How do I fix this?

  • Please run the Boot Info Script. This will generate a file called RESULTS.txt. Post that file to a pastebin site and post the URL to your document here. This will give us more details about your configuration, which is required to base an answer on more than guesswork. – Rod Smith Jun 22 '16 at 16:46

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