Comment 3 for bug 1875441

I installed ubuntu-mate-desktop last night and can confirm Magnus loads at startup in KDE, my usual desktop, even though there is no autostart entry for it in ~/.config/autostart. I would look into how to disable that in MATE, but unfortunately that DE is unusable, as outlined in the forum link below (in short, the 3 folders I have load in Caja at startup cause a loop of endlessly loading instances of those folders, whereas in KDE and Gnome I only get 3 folders):

https://ubuntu-mate.community/t/ubuntu-mate-desktop-loads-hundreds-of-folders-after-install-keeps-going/24805/9

Since I can't find any mention of "magnus" in gsettings, I think the easiest way around this is to uninstall this app.

EDIT: I found that MATE stores its autostart entries in /etc/xdg/autostart instead of ~/.config/autostart, so one can delete magnus-autostart.desktop from there to stop it from loading at startup.