Is it possible to mount a folder, which is shared by another person into my Ubuntu-One folder (or any other) to my Ubuntu system (not the Web-interface). It also would be nice to do this via fstab.
Ubuntu One's file sync service is synchronization, and not remote file storage. This means the client will download everything in a folder to the machine you choose to synchronize that folder to, rather than creating a mount point to a remote server.
If you've accepted a share from someone, you can open the Ubuntu One control panel and in the