Install The Official Telegram Desktop App In Ubuntu Or Linux Mint Via PPA
There are official Telegram clients for Android, iOS, WP, Mac OS X, as well as for the desktop: Windows, Mac OS X and Linux (along with a web-based version, Chrome app) and quite a few unofficial clients. The official Telegram Linux desktop app is not packaged for Ubuntu so to make it easier to install, Lorenzo from atareao.es has created a PPA.

The Telegram desktop application supports desktop notifications, stickers (Telegram only has a few for now, but more will follow soon), sending and receiving attachments (documents or photos), adding contacts and so on. What it doesn’t support is sending voice messages (you can listen or download received voice messages though).

This looks like we may finally have an easy to use and configure secure private communications tool, that Governments and Corporations can't snoop on. I'm going to be installing this on my PC (That's Ubuntu PC not Windows PC or Mac OSX PC), and testing it out.