hexchat-perl software package provides Perl plugin for HexChat, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install hexchat-perl
hexchat-perl is installed in your system.
Make ensure the hexchat-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep hexchat-perl *
You will get with hexchat-perl package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Network |
| Package | hexchat-perl |
| Version | 2.10.2-1ubuntu3 |
| Description | Perl plugin for HexChat |
| Sub Section | Net |