Install libcheck-isa-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libcheck-isa-perl
Description:
Perl module for correct checking of an object's class
The Check::ISA module provides several functions to assist in testing whether a value is an object, and if so asking about its class. It allows an object to be examined using various methods provided by Perl's UNIVERSAL class.
Homepage: https://metacpan.org/release/Check-ISA
Version: 0.09-1
Section: universe/perl