Ubuntu server 14.04.3 can be installed only with EFI partition but I can't boot

[Victor Sterpu]

Hello

I installed Ubuntu server 14.04.3 a lot of times today.
My setup is 2 HDD in RAID 1, /boot, root and swap partitions.
If I install Ubuntu without a EFI partition I receive the error "This 
GPT partition label contains no BIOS Boot Partition" when grub installs 
and I can't boot.

If I create a new partition of type EFI(RAID1) then grub install fine 
but I can't boot from the system.
The Bios is in UEFI mode.
How can I fix this?

Thank you.