Franz is your messaging app for WhatsApp, Facebook Messenger, Slack, Telegram and many many more. Follow the below steps to install Franz Messenger App in Ubuntu 18.04:
root@mangesh:~$ sudo apt-get update
root@mangesh:~$ wget https://github.com/meetfranz/franz-app/releases/download/4.0.4/Franz-linux-x64-4.0.4.tgz
root@mangesh:~$ mkdir franz
root@mangesh:~$ tar -xzvf Franz-linux-x64–4.0.4.tgz -C franz/
root@mangesh:~$ cd franz/
root@mangesh:~/franz$ ls
root@mangesh:~/franz$ ./Franz