GNU/Linux KDE Neon Installing Google Hangouts desktop Client Guide
How to Install Google Hangouts Chat Messenger desktop Client on KDE Neon GNU/Linux – Step by step Tutorial.
And Google Hangouts for KDE Neon is a Cross-Platform unified Communications Service that allows members to initiate and participate in Text, Voice or Video Chats.
And to Install Google Hangouts Client on KDE Neon you dispose of some cool Alternatives:
Especially relevant: currently Ferdi is the only completely Free alternative, and so I listed them in order of my Personal Testing Preference.

Google Hangouts Client KDE Neon Installation Guide
- Rambox Install KDE Neon Step-by-step Guide
- Ferdium Install KDE Neon Step-by-step Guide
- Franz Install KDE Neon Step-by-step Guide