one more piece of information I thought of.As root, I tried running the script I mentioned in message 46 above https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=884530#46
This is the output. no success: [root@sid bin]# pwd /home/ed/Dropbox/bin [root@sid bin]# ./mountallUSBError connecting to the udisks daemon: Error calling StartServiceByName for org.freedesktop.UDisks2: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit udisks2.service not found.