@guiverc, @De-Luxis, please see my investigations of this bug on Can’t change keyboard locale on logon screen with lxqt (Lubuntu 19.04, 19.10 and 20.04), especially my comment about clean install: Can’t change keyboard locale on logon screen with lxqt (Lubuntu 19.04, 19.10 and 20.04)#10.
It seems like a root cause of this crazy bugs is some “problem” with installation media (since LXQT ever created), because layouts works perfect after manual installation of Lubuntu over “clean” Ubuntu (and it’s not a bug of sddm itself).
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