GNU/Linux Ubuntu 18.04 Installing Android 9.0 Emulator Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install Android 9.0 Pie Emulator Virtual Machine in GNU+Linux Ubuntu 18.04 Bionic LTS Desktop.
And this is the easiest way to dispose for Free of a nicely performing Android 9.0 Emulator on Ubuntu for running & testing Android Apps on GNU/Linux.
Android 9.0 Emulator Ubuntu 18.04 VirtualBox VM Setup