Google chrome on ubuntu 16.04 does not load the url to link the client. It loads up google chrome but the page is blank with no url in the url bar.
For anyone else having the same problem you will have to use firefox.
Set firefox as the default browser Settings -> Details -> Default Applications then from the dropbox client click sign in and it will load up firefox with the url and you can link the client.
I spent about an hour installing/uninstall/rebooting and even compiling the source code trying to get dropbox client to work then i suspected the issue maybe with google chrome so i switched to firefox and it worked.
My current version of google chrome is:
Version 63.0.3239.132 (Official Build) unknown (64-bit)
Can dropbox team please look into this issue thanks.