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« Last post by ro_sid on Today at 10:30:08 »
This is a periodically (re-)appearing effect, that to my knowledge is unique to the combination of the "sddm" display manager and KDE/plasma. The effect is, that the enter/return key does not do anything. I, myself, experienced it regularly when upgrading a live (Siduction) KDE-iso image. Sometimes even the window-decorations get lost.
Why am I telling this: Apart from @scholle1's valuable tip to boot into a terminal screen instead of the graphical greeting screen, you can also always do it, even once you are "on sddm". The "ctrl-alt-F?"-mechanism still works, even then!
So press (e.g. ctrl-alt-F3) and you are on a terminal window ("F1" contains the startup messages, "F2" is the sddm-screen"). After logging in from there, you can do anything that does not require "graphics", especially you can update/upgrade.
Usually after some time, when sddm/kde/plasma/qt got their act together, everything works "normal" again!
Such things only happen with rolling releases or sid/unstable (or experimental) versions, not the stable ones and rarely in testing(/trixie). It is the price we have to pay for it, especially during transitions.
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