To be more precise, Dropbox ships only deb file for Ubuntu, which did not work for me, because of the depenendy to libnautilus-extension1 library:
$ sudo dpkg -i nautilus-dropbox_0.6.7_i386.deb
Selecting previously deselected package nautilus-dropbox.
(Reading database ... 176727 files and directories currently installed.)
Unpacking nautilus-dropbox (from nautilus-dropbox_0.6.7_i386.deb) ...
dpkg: dependency problems prevent configuration of nautilus-dropbox:
nautilus-dropbox depends on libnautilus-extension1 (>= 1:2.22.2); however:
Version of libnautilus-extension1 on system is 2.30.1-2.
dpkg: error processing nautilus-dropbox (--install):
dependency problems - leaving unconfigured
Processing triggers for hicolor-icon-theme ...
Processing triggers for man-db ...
Errors were encountered while processing:
But one can try to compile it from sources and it seems to work for me. Download and extract sources from: here.
Now, install necessary library requirements:
sudo apt-get -f install
sudo apt-get install libnautilus-extension-dev
sudo aptitude install python-docutils
After this try to compile dropbox:
sudo make install
If compilation does not break, you should have Dropbox icon in your menu under Internet section (I use KDE) and in system tray.