Win 8.1.... For me there is no 'Advanced Options' tab inside the Troubleshoot menu... so I can't alter UEFI secure boot function status in order to set up dual boot to linux.... the Troubleshoot only takes me to 'advanced startup options' menu... nothing else... No 'Refresh' or 'Reset' tabs short of reinstalling the whole system...?

Any idea how to restore the missing Advanced options...?