Install Dropbox headless
# Install Dropbox daemon
cd ~ && wget -O - "https://www.dropbox.com/download?plat=lnx.x86_64" | tar xzf - && ~/.dropbox-dist/dropboxd
# Install `dropbox` script to control Dropbox
sudo wget https://www.dropbox.com/download?dl=packages/dropbox.py -O /usr/local/bin/dropbox && sudo chmod +x /usr/local/bin/dropbox