Dropbox won't start, it was working fine until last week, so I tried to see what happens if i started it from terminal
Starting Dropbox...Dropbox isn't running! Done!
If I try to run it again, it says
dropbox start Dropbox is already running!
Naturally, it is easy to misinterpret statements, such as you read in terminal. Your 'dropbox start' statement, in fact, started Dropbox to running in the background! and the 'done' part of the statement only served to affirm that it is now running. The earlier part of the statement indicated that yes, dropbox start is a welcome order due to the fact that it is not yet running. Very simple, also very simple to misunderstand.
I have had the same problem when trying to run dropbox to a linux server. What was strange is it only happened when I had X11 forwarding on from putty (yet i had not installed X on the machine...)
Try to have X forwarding disabled (on putty do not check the X11 forwarding), it worked for me...
One note: try to also run .dropbox-dist/dropboxd directly, it might give you some hint on what is going on, such as if it has not yet registered the device.
The above solutions didn't help me. After a time-consuming debugging session I found two ubuntu packages which are important for Dropbox to work:
apt-get install libxslt1.1 libxxf86vm1
After installing them, the message when starting was (make sure there is no dropbox process running when starting):
user@xubuntu:~$ dropbox start Starting Dropbox...Dropbox isn't running! Done!
... which means (not obviously): success :-)
thunar-dropbox-plugin (I mean for starting Thunar directly from the tray icon) you need at least the following extra packages:
apt-get install --no-install-recommends thunar-archive-plugin xdg-utils