$ sudo apt-get update
$ sudo apt-get install libpoconetssl9 

libpoconetssl9 is installed in your system.

Make ensure the libpoconetssl9 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libpoconetssl9 *

You will get with libpoconetssl9 package name, version, architecture and description in a table

libpoconetssl9 package basic information: