$ sudo apt-get update
$ sudo apt-get install libcitygml-bin 

libcitygml-bin is installed in your system.

Make ensure the libcitygml-bin package were installed using the commands given below,

$ sudo dpkg-query -l | grep libcitygml-bin *

You will get with libcitygml-bin package name, version, architecture and description in a table

libcitygml-bin package basic information: