Ratastantan (atys)
I just want to add that the bug mentioned in the post by Tiximei has been fixed with the latest update (at least) from this ppa: "http://ppa.launchpad.net/ryzom-isv/ppa/ubuntu saucy main"
Ubuntu users with the recent update can access apartements, guild halls and other rooms without problems.
Thanks! About to check that out now. For some reason the ubuntu software center installed ryzom on this computer but didn't set up any apt source to keep it up to date.