I decide to write here because it is important for me (and I am sure that I am not the only) the steps necessary to install GPU drivers for AMD RX 580 (8Gb).
I am little bit desperate because I already install in few days (4 days) system (Linux Ubuntu 16.04.3, 64 bit) by a lot of times because after I install drivers (amdgpu-pro-17.40-483984) I cannot enter in the system.
So, any recommendation is welcome take into account dual GPU mining !!!
Thanks to all members of community for support !
All the best !