Dropbox, dbus and PCManFM
I'd like to ask whether
systemctl start dropbox@<username> works instead of the ugly command
dbus-launch dropboxd you proposed. See Dropbox#Run as daemon with systemd for details. I'm asking because I'm thinking of using the command in other examples in the Dropbox#Dropbox on laptops section, and if it solves this problem, it should be really better than what we have now.