libsafe-isa-perl software package provides module for calling isa and friends on things that may not be objects safely, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libsafe-isa-perl
libsafe-isa-perl is installed in your system.
Make ensure the libsafe-isa-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libsafe-isa-perl *
You will get with libsafe-isa-perl package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Perl |
| Package | libsafe-isa-perl |
| Version | 1.000004-1 |
| Description | module for calling isa and friends on things that may not be objects safely |
| Sub Section | Perl |