Black screen with cursor after updating KDE Neon to Plasma 6

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It’s a known issue. Try running the following in the teminal

sudo apt autoremove
sudo pkcon refresh
sudo pkcon install libdecor-0-0
sudo pkcon install libsdl2-2.0-0
sudo pkcon install plasma-desktop
sudo pkcon install plasma-desktop-data
sudo reboot

This is a proposed solution that you can find in reddit.

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