@steriX

Yes Refind!!! is the best boot manager available to do this... It's a pain to setup... or at least it was for me. The partitioning was tricky on my macbook air. I built out 3 partitions 2 for the core os's and 1 for swap. I had some issues with Ubuntu during the installation process and that grub manager is a pain. It would be nice to replace it completely with EFI boot manager... more research required.