$ sudo apt-get update
$ sudo apt-get install psi-plus-webkit-dbg 

psi-plus-webkit-dbg is installed in your system.

Make ensure the psi-plus-webkit-dbg package were installed using the commands given below,

$ sudo dpkg-query -l | grep psi-plus-webkit-dbg *

You will get with psi-plus-webkit-dbg package name, version, architecture and description in a table

psi-plus-webkit-dbg package basic information: