$ sudo apt-get update
$ sudo apt-get install libosgearthsymbology2 

libosgearthsymbology2 is installed in your system.

Make ensure the libosgearthsymbology2 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libosgearthsymbology2 *

You will get with libosgearthsymbology2 package name, version, architecture and description in a table

libosgearthsymbology2 package basic information: