Thanks for the report — this is close to expiring as Incomplete, so I
wanted to ask for the details that would let someone narrow it down.
Could you attach: (1) the output of `journalctl -b -1 -u sddm` from a
boot where the black screen happened (you mention running this, but the
log text itself isn't attached); (2) your graphics hardware and driver
in use — e.g. `lspci -k` for the VGA device and `ubuntu-drivers
devices`; (3) the installed SDDM and Plasma versions (`apt policy sddm
plasma-desktop`) and kernel (`uname -r`); (4) the exact Lenovo model.
One more thing that would help: does the greeter crash on every boot, or
only after a recent system update? Thanks!

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https://bugs.launchpad.net/bugs/2166781

Title:
  When booting up into Kubuntu 26.04, the screen remains black with a
  movable mouse pointer.

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