Unixcop published a tutorial about installing MyPaint on Ubuntu 20.04 or 22.04 LTS.

How to Install MyPaint on Ubuntu 20.04 | 22.04 LTS

In this guide, we will show you how to install MyPaint on Ubuntu Systems. MyPaint is a free and open-source raster graphics editor for digital painting. It is available for Windows, macOS, and Unix-like operating systems. MyPaint is python3 support and supports graphics tablets made, symmetry modes, layer management and dynamic brush library. 

How to Install MyPaint on Ubuntu 20.04 | 22.04 LTS - Unix / Linux the admins Tutorials