I have the same problem, and I’m using SDDM. My autologin.conf got deleted, so I figured it was a matter of restoring that, but no dice so far.
Edit: Ah, never mind. I forgot that autorun.conf is replaced by this kde-settings file there. Changed plasmawayland to plasma, there, and it started working.
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Were you using SDDM for auto login? And wayland or X11?
I have the same problem, and I’m using SDDM. My autologin.conf got deleted, so I figured it was a matter of restoring that, but no dice so far.
Edit: Ah, never mind. I forgot that autorun.conf is replaced by this kde-settings file there. Changed plasmawayland to plasma, there, and it started working.
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Demoncracy is a KDE and linux user?! Cool.