perhaps install rEFInd as the boot selector, ISTR there's a thread on that in here somewhere
Installing refind is all nice when you know what you're talking about and that is not the case with me.
I only want one OS running on my mac mini and that is libreelec. I don't want to use the system from mac but use refind. When i install refind using ubuntu and then install libreelec with the usb stick libreelec doesn't give you any option to install it on a specific partition but uses the entire disk thus wiping the refind installation as well and i end up with that crappy startup from mac mini that is just too instable to work with.
if libreelec gave the option to install the software on a specific partition i created than it wouldn't be a problem but it just once to wipe the entire disk.