@jakke1990 Does the above direct launch method work?
Not. I reinstalled whole operating system. Now all works right.
From the logs and the information you gave, it seemed like your theme was looking for files that did not exist, making SDDM malfunction. I think that my last commands to launch Plasma directly would have worked.
It is possible that the same problem will repeat if that theme is installed again.
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I don’t install it again. I will use default themes.
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