$ sudo apt-get update
$ sudo apt-get install libktexteditor-perl 

libktexteditor-perl is installed in your system.

Make ensure the libktexteditor-perl package were installed using the commands given below,

$ sudo dpkg-query -l | grep libktexteditor-perl *

You will get with libktexteditor-perl package name, version, architecture and description in a table

libktexteditor-perl package basic information: