I am also having a difficult time mounting an external Qnap NAS Drive with Ubuntu 13.10. The NAS is connected to my router via a cat 5 cable as is my computer and DAC. In Ubuntu I can click in the Files application, and then open the Browse Network, see the NAS, click on it and get the prompt for the user ID and password. Once that is entered, I can see the directories and browse through the files. If I hover over the drive with the mouse, it displays "smb://databox.local/music/" I would think the drive is mounted at that point, but when I enter the df -k command in a terminal window, the only drive I see is the computer's internal hard drive. I don't understand how I can browse files on the NAS in the File application if it is not mounted.
I also tried the mount commands near the top of this thread and no luck. Any help would be appreciated.