Comment 0 for bug 1481925

Currently NVIDIA's upstream installer will emit a "The distribution-provided pre-install script failed! Are you sure you want to continue?" message when /usr/lib/nvidia/pre-install script returns error (which is hard-coded to always return 1 no matter that ubuntu-provided NVIDIA proprietary driver exist or not), logics should be implemented from letting NVIDIA proprietary installer display that confusing message to the user when the system is free of ubuntu-supplied NVIDIA proprietary drivers.