Laofa (atys)
Sorry, I just see this topic...
In french forum with have work about linux. And static client in 64bit, last version here :
http://app.ryzom.com/app_forum/index.php?page=post/view/126551
Not official but tested and approuved.
In ubuntu, there are repository of kervala, too, I'm not sure but probably with 64bit client to...
The 64bit static build you linked to randomly makes my computer crash (the standard 32bit build didn't).
I am downloading a build from http://bundles.openttdcoop.org/ryzom/nightlies/ right now to try.