I use the package:
It works fine. But I do not know how to make the numbers old style. So I tried
But it's not working.
How can I solve my issue?
xelibertine package is quite old and unsupported. I find this in the SourceForge site of LinuxLibertine.org
The up-to-date interface to Linux Libertine for XeLaTeX and LuaLaTeX is the package
In order to get oldstyle digits, you can call it by