Greetings; I was trying to install Dropbox using the AppCenter to no avail. I found a work around and thought I would share. I have been using Ubuntu for a number of years. It works better but I am enjoying a change. Elementary is supposed to be a slimmed down alternative but that is definitely not the case. The download size alone reveals that. Well, back on topic, I installed the git repository and install Dropbox according to the instructions found here: https://github.com/zant95/elementary-dropbox It works fine now. Hope this helps others!