Qt Creator Ubuntu 19.04 Installation Guide
Hi! The Tutorial shows you Step-by-Step How to Download and Install QT5 SDK and Qt Creator Open Source in Ubuntu 19.04 Disco 64-bit GNU/Linux Desktop.
And the QT5 SDK for Ubuntu Disco includes the Tools you need to build Desktop, Embedded and Mobile Applications with Qt from a single install. This is the recommended way to get started with Qt.
Finally, the Guide includes detailed instructions to Getting Started with Qt Development.

1. Launching Terminal
Open a Command Line Terminal window
Ctrl+Alt+t on Desktop
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.