I just got a new Macbook 9,1 (released in 2016, and not Macbook Pro 9,1!!) and am new to Ubuntu. Does Macbook 9,1 support the latest verison of Ubuntu?
You will have quite a few driver problems. If you are capable of dealing with that and a boot manager like rEFInd, then it's pretty simple if you have a USB-c to USB-a dongle with 2 USB-a ports or a USB-a hub with your USB-c to USB-a dongle.
You will also need to install gdisk (gpt fdisk for Mac). The commands for it and a more detailed installation for Macs in general can be found here.
It's possible to fix touchpad and keyboard on macbook9.1, read the few last posts at https://bugzilla.kernel.org/show_bug.cgi?id=99891 Though now I can't boot livecd on macbook9.1 2016 without passing acpi=off but that seems to make ssd undetectable :( I've tested ubuntu 16.04.1 a month ago on macbook9.1 2015 and livecd boots ok without that option and ssd was right there. I've tried to make a topic on this but it was closed as "duplicate"