Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Install with snapd
Don't have snapd? Get set up for snaps.
HexChat is an easy to use yet extensible IRC Client. It allows you to securely join multiple networks and talk to users privately or in channels using a customizable interface. It supports features such as: DCC, SASL, proxies, spellcheck, alerts, logging, custom themes, and Lua scripts.