Brave AI came back with this.
You are experiencing an issue with caja-dropbox on Ubuntu MATE where the client displays "Starting" but does not synchronize files. This problem can be caused by several factors, and the following solutions have been reported to work in similar situations:
If you are using the Mate desktop, you should try uninstalling
nautilus-dropboxand installingcaja-dropboxinstead.
askubuntuYou can try stopping caja-dropbox, removing the
.dropboxand.dropbox-distfolders, and then reinstalling caja-dropbox.
ubuntu-mate communityAnother approach is to stop caja-dropbox, remove the existing configuration, and then reinstall it.
ubuntu-mate communityIf the issue persists, you might need to check the permissions and ownership of your Dropbox folder and related files using commands like
sudo chownandsudo chmod.
DropboxAdditionally, if you encounter an error message about not being able to monitor the Dropbox folder hierarchy, you can run the following command to increase the inotify watch limit:
echo fs.inotify.max_user_watches=100000 | sudo tee -a /etc/sysctl.conf; sudo sysctl -p.
antropy.co.ukIt is also possible that the problem is related to the specific version of Ubuntu MATE you are using, and updating your system or the caja-dropbox package might resolve the issue.
Not sure if any of these will help.