I installed Xubuntu 16.04 one month ago. Since about one week Dropbox asks for an updated to the last version and now it has stopped syncing. I already has the latest version installed (also checked on the dropbox website). Any hint? Thank you

I installed Xubuntu 16.04 one month ago. Since about one week Dropbox asks for an updated to the last version and now it has stopped syncing. I already has the latest version installed (also checked on the dropbox website). Any hint? Thank you

Have you tried this?
Quit Dropbox from running.
dropbox stop
Delete ~/.dropbox-dist.
rm -r ~/.dropbox-dist
Now just run the two commands under the "Dropbox Headless Install via command line" option here https://www.dropbox.com/install?os=lnx. Select whether you have a 64 or 32 bit machine.
This will preserve the Dropbox cache so it won't re-sync everything. If this does not work, you may want to consider a complete uninstall and purge, and reinstall of the Dropbox program. (There is of course no need to remove the files in your Dropbox folder as all of this pertains to the program.)
Here's a fix based on the previous answers that worked fine for me:
1) dropbox stop
2) rm -r ~/.dropbox-dist
3a) (for a 64 bit machine) cd ~ && wget -O - "https://www.dropbox.com/download?plat=lnx.x86_64" | tar xzf -
3b) (for a 32 bit machine) cd ~ && wget -O - "https://www.dropbox.com/download?plat=lnx.x86" | tar xzf -
4) start dropbox
That worked except for the missing dropbox icon on the panel. To fix it I followed the advices from this post.