Have a Raspberry Pi and want to start a GUI emulator program or similar directly on bootup?
This is a good article about two easy and common ways to set up autostarting a GUI user program on a Raspberry Pi on bootup. First, set up auto-login, then on the auto-login account, set autostart either in your .bashrc file or in an lxsession autostart file.
20191213/DuckDuckGo raspberry pi freedesktop autostart
20191213/https://blog.startingelectronics.com/auto-start-a-desktop-application-on-the-rapberry-pi/
A third, more advanced method of my own? Add your program to “/etc/shells”, then use “chsh” on the auto-login account to set your program as its “shell”.
Also, yet another method which I recommend more for GPIO software than
for GUI software is ot start your user program from a systemd unit
file. See my older blog article related to this subject for more info.