Using Ubuntu 14.04:
check BIOS to...
* switch to AHCI
* CSM on !
* quick boot on or off
* use MBR instead of GPT
* installed System on Flash, HDD used for Data storage
installed plain forward Ubuntu 14.04 without manual partitioning,
then it worked with GPT and the automatically installed EFI partition also in secure boot mode
be aware that a following installation of W8 kicks out the secure boot entry of linux !