HexChat is an IRC chat program. It allows you to join multiple IRC channels (chat rooms) at the same time, talk publicly, private one-on-one conversations etc.

HexChat is based on XChat, but unlike XChat it’s completely free for both Windows and Unix-like systems. Since XChat is open source, it’s perfectly legal. For more info, please read the Shareware Background.

Install HexChat in Ubuntu:

HexChat stable PPA provides packages for Ubuntu 12.10, 12.04, 11.10, and 11.04.

Launch a terminal window from the dash or press Ctrl+Alt+T. Copy and paste this command into terminal and hit enter to add ppa:

sudo add-apt-repository ppa:gwendal-lebihan-dev/hexchat-stable

Then update and install hexchat:

sudo apt-get update && sudo apt-get install hexchat

After that, launch hexchat from the dash: