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What if you replace /etc/gdm/custom.conf w/ the default one?
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Does it works with a fresh new user?
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It does not work with a fresh new user or an old account besides mine.
The only change to GDM's custom.conf was based on a suggestion in this thread, it was untouched before.
I've now spent enough time on this and don't wish to anymore.
Seth's suggestion of using another DM, LightDM in my case "fixes" the issue, whatever that might be with GDM.
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