Dropbox isn't syncing my files. How do I sync my Dropbox folder?

Technical details:

The system requirements for the Dropbox Desktop application have changed since October 2018.  The application is no longer supported for Ubuntu 13.10 and below, and Fedora 20 and below.  Further, the Dropbox Desktop application  for Linux-based computer systems only supports the ext4 file system. 

How do I install Dropbox on my machine?

You can access dropbox from the Applications->Internet menu or by typing dropbox from a command prompt. The first time you run it, you should do dropbox install -i and configure the account.