Installing Dropbox in an Ubuntu system that uses a proxy can be quite frustrating, as I have experienced. So here is a workaround.
- Download the Dropbox daemon from here (for 32-bit) or here (for 64-bit)
- Extract the downloaded archive. A hidden folder called .dropbox-dist is created in your Downloads directory.
- Open a terminal, navigate to the folder where you have the extracted .dropbox-dist folder, and type
$ .dropbox-dist/dropboxd
- Finish the setup.
- Open startup applications, and add the file dropboxd.
- And voila! You’re done!