What documents directory do you mean? Take this scenario and go from there. 1) Plug your N900 into your usb port and select mass storage. 2) You will get a "Nokia N900" drive. Copy your deb file here, e.g. "file.deb". 3) Unmount your phone. 4) Open a terminal 5) Type "root" - Your terminal name will change to "Nokia-N900-42-11:~#" 6) Type: "cd /home/user/MyDocs" 7) Type "ls" - You will see the contents of this directory, including "file.deb" which you copied. 8) Type "dpkg -i file.deb" Obviously do not include the quotations above, they include what you need to type. And note that directory names are CASE-sensitive, so write them exactly as shown above.