Vega64 Problem Ubuntu Opencl

[Strebba90]

Hi guys,
i bought some AMD vega 64 for testing.
for logistic reasons i use as OS only ubuntu.
now...i try with all lastest version of ubuntu and lastest driver of AMD, but i have the same problem.... "opencl not found".
with dmesg the card are recognize.
someone who has tried them on linux could recommend the version of ubuntu and drivers to install?
Thanks in advance