Just for completeness, I informed Dropbox of this problem and I'm waiting some news from them (David Euresti in particular, I just subscribed him to this bug). It's not really specific to the Ubuntu package, the dropbox wrapper fails in the same way when you run "dropbox start -i" for the first time after an installation from source.
The "work-arounds" suggested by others in this bug report are just explanations of how to do a manual installation (what the wrapper is supposed to automate).
Just for completeness, I informed Dropbox of this problem and I'm waiting some news from them (David Euresti in particular, I just subscribed him to this bug). It's not really specific to the Ubuntu package, the dropbox wrapper fails in the same way when you run "dropbox start -i" for the first time after an installation from source.
The "work-arounds" suggested by others in this bug report are just explanations of how to do a manual installation (what the wrapper is supposed to automate).