Ubuntu :: Start Python Script At Boot?

I am trying to get a python script to start when the pc is booted. I'm running ubuntu server without a GUI... just CLI.

I have a python script called /home/username/bin/dropbox.py that runs perfectly if I do:

Code:
sudo python /home/username/bin/dropbox.py start

All I want to do is invoke the command I wrote up there when the pc boots up without any user logging in.

I added the above command just like that in rc.local but that didn't work. I tried creating a bash file, where in the bash file I did:

Code:
#!/bin/bash
cd /home/username/bin/
./dropbox.py start

and then added the bash file to rc.local, but that didn't work (I made sure the bash file was executable).