Ehm. I see you have left everything in the /built/ dir, its more recommended to do something like this:
the contents of built/bin to /usr/bin
the contents of built/lib to /usr/lib
the contents of built/etc to /etc/
the contents of built/include to /usr/include/panda3d
and, ehrm. put the rest in /usr/share/panda3d
(if i didnt forget anything)
That works just fine for me.