Setting up a cron job that does a chmod/chown
You want your root cron script (edit by running sudo crontab -e) to be: 55 * * * * /bin/chown -R somename /home/somename/Dropbox && /bin/chmod u+rw /home/somename/Dropbox Assuming the user is named somename and that /home/somename/Dropbox is the full path of your Dropbox directory. As root user, ~ goes to /root.