Auto login and run application with Ubilinux4 UP Squared

Create the file /etc/sddm.conf and place the following in it:

[Autologin]
User=yourusernamehere
Session=lxqt.desktop

Then, in lxqt, open the app-menu -> Preferences -> LXQT settings -> Session settings, and add whatever you want in the autostart-section.