Install pidgin with Facebook chat, Google Talk/Hangouts. Slack client, facebook client.

multi-chat-installer.sh

sudo apt-get update
sudo apt-get install pidgin -y

sudo sh -c "echo 'deb http://download.opensuse.org/repositories/home:/jgeboski/xUbuntu_$(lsb_release -rs)/ /' >> /etc/apt/sources.list.d/jgeboski.list"
cd /tmp && wget  http://download.opensuse.org/repositories/home:/jgeboski/xUbuntu_$(lsb_release -rs)/Release.key
sudo apt-key add - < Release.key  
sudo apt-get update
sudo apt-get install purple-facebook

sudo apt-add-repository -y ppa:rael-gc/scudcloud
sudo apt-get update
sudo apt-get install scudcloud

wget https://github.com/Aluxian/Facebook-Messenger-Desktop/releases/download/v1.4.3/Messenger_linux64.deb -O /tmp/messenger.deb
sudo dpkg -i /tmp/messenger.deb