Download the following package:
https://linux.dropbox.com/packages/debian/dropbox_1.6.0_amd64.deb
Then install it by double-clicking or with DPKG (dpkg -i
Next, edit the file /etc/sysctl.conf
sudo vi /etc/sysctl.conf
and add the following directive:
fs.inotify.max_user_watches=100000