1. Download the latest .deb file from here, if you are using the CSE-64.ova appliance that is on the file server then it is already downloaded for you in your ~/Downloads folder.
2. cd into the directory where the .deb file resides, usually ~/Downloads.
3. Run the following command, replacing 'dropbox.deb' with the name of the .deb file on your system.

sudo dpkg -i ./dropbox.deb

Once installed it will ask you to allow it to download and install a proprietary daemon, allow it and wait. If it does not prompt you run dropbox start -i. Once complete your browser should pop-up asking for your dropbox credentials, login and your Dropbox should be at

~/Dropbox

sudo apt-get -f install

First start dropbox by running this command

dropbox start -i

Then run this command to enable startup on boot.

dropbox autostart y