$ sudo apt-get update
$ sudo apt-get install libpocoutil9 

libpocoutil9 is installed in your system.

Make ensure the libpocoutil9 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libpocoutil9 *

You will get with libpocoutil9 package name, version, architecture and description in a table

libpocoutil9 package basic information: