$ sudo apt-get update
$ sudo apt-get install libsoqt4-20 

libsoqt4-20 is installed in your system.

Make ensure the libsoqt4-20 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libsoqt4-20 *

You will get with libsoqt4-20 package name, version, architecture and description in a table

libsoqt4-20 package basic information: