If you've installed keybase on Linux you can:
Keybase is available for the following OSs, Smart Phones, and Web Browsers: Linux, MacOS, Windows, Android, iPhone, Chrome, and Firefox.
Documentation on Keybase can be found here.
Keybase is now supported by the Stellar Development Foundation to support the cryptocurrency Lumens. Learn more about this Here and Here.
"A common mistake that people make when trying to design something completely foolproof was to underestimate the ingenuity of complete fools." *Douglas Adams* / *Mostly Harmless*