$ sudo apt-get update
$ sudo apt-get install liblatex-decode-perl 

liblatex-decode-perl is installed in your system.

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

$ sudo dpkg-query -l | grep liblatex-decode-perl *

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

liblatex-decode-perl package basic information: