I bought a new machine, New Intel i7 Haswell-E 6 Cores processor, 16Gb 3000MHz DDR4 Memory on a GA-X99 Mobo.I put in it 3 new SDD Disks: One for a clean Windows 10 (Works Fine), One for a clean Hackintosh (Works fine, but have same problems with the bootloader) and one for Ubuntu Gnome x64 15.04.In my previous machine (an old DDR2 800Mhz, Intel Core2Quad q9550 machine) Grub2 solved all my boot problems, but all the systems runs under MBR scheme and the Operating Systems shared disks.Now all the systems boots under UEFI scheme and Grub2 do not see the other systems.I  installed Grub2 on the Ubuntu Disk with the two other OS partitions mounted on linux but grub2 can't recognize the other 2 OSs. 
LINUX Ubuntu Gnome 15.04 Grub2 doesn't detect other SO
boot;grub2