$ sudo apt-get update
$ sudo apt-get install libsmokektexteditor3 

libsmokektexteditor3 is installed in your system.

Make ensure the libsmokektexteditor3 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libsmokektexteditor3 *

You will get with libsmokektexteditor3 package name, version, architecture and description in a table

libsmokektexteditor3 package basic information: