Paint on Linux

Paint comes with Windows, so it won't be on a new Linux PC. This free app does the same job, and TuxPick installs it for you.

Pinta

Also on Windows

A simple paint and photo editing app.

Installs from Flathub.

Press the install button above. TuxPick opens with the app already ticked. Add anything else you need.
Download the installer file.
Open a terminal with Ctrl Alt T, run the one line TuxPick shows you, and type your password when asked.

It works on Ubuntu 22.04 and 24.04, and on systems built on them like Zorin OS and Pop!_OS.