I dowloaded the last stable version from
https://www.qubes-os.org/downloads/#qubes-live-usb-alpha/, which is Qubes R3.1 x86_64, checked the signatures and all that, and created an USB installation device using "dd if=Qubes-R3-x86_64.iso of=/dev/sdX" as instructed in
https://www.qubes-os.org/doc/installation-guide/. I rebooted the computer and, after que installation wizard started, I selected "test media & install qubes". The test returned no errors after verification of 100% of the USB stick, and immediately after that a black screen with the qubes symbol and some sort of progress bar have shown up, with the progress set about half of total. The problem is that after 5, 10, 15 minutes nothing happens, and no error messages are given. Apparently my laptop fulfills all hardware requirements shown in
https://www.qubes-os.org/doc/system-requirements/, with my processor being Intel(R) Core(TM) i7-6500U which, according to
http://ark.intel.com/products/88194/Intel-Core-i7-6500U-Processor-4M-Cache-up-to-3_10-GHz, has both Intel VT-x and VT-d technologies. Does anyone has any advice? Thank you...