I have tried numerous methods to install dropbox. This includes through snap, the choices on the dropbox page, and nautilus-dropbox. There is no toolbar icon for syncing with the web site. The daemon (dropboxd) will not start. The systemctl unit command will not even show it as a unit file. I have been working on this for 3 days but to no avail. Dropbox tech support wanted me to do an advanced install but that did not work either.
It is running perfect on Ubuntu 20.04-2 LTS.
All of this happened after I upgraded from Ubuntu 20.04 LTS.