I've got the following:
- a late 2013 MacBook Pro
- an external ssd
- a USB stick
I would like to install Ubuntu 16.04 into the external ssd and boot my MacBook into it. I successfully created the ubuntu live USB and boot into it via the boot menu, and successfully install ubuntu into the external ssd. Everything works fine until I reboot the MacBook and try to boot into ubuntu, and the external ssd with ubuntu installed just won't show up in the boot options. I've tried unplug and repluging the ssd, and reboot my MacBook but none of these works. So how can I solve this? Any help would be appreciated.