Mutual GNU / Linux

Turn it executable (in property>permission, but it's probably executable yet). Then open terminal in the file .ryzom (or in terminal : cd /home/user/.ryzom) and tip :

./ryzom_update.sh


That's all.

Because english is not my comfort language, if you want more information about permission, you can read this : https://help.ubuntu.com/community/FilePermissions.