/usr/lib/libosgEarthSymbology.so.3 is in libosgearthsymbology3 2.5.0+dfsg-2+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libosgEarthSymbology.so.2.5.0
/usr/lib/libosgEarthSymbology.so.2.5.0