Compositor broke? How to fix

Hello,

And with that you removed a lot of other components required…
Your system was flawed the moment you mixed KDE Plasma with Deepin.

Yet you did it in a 9 minutes interval from your first post.

Look inside /var/log/pacman.log and reinstall the removed packages except the Deepin ones.
Probably this will help from TTY (if you have access to it) either booting in runlevel 3, or:

sudo pacman-mirrors -f && sudo pacman -Syyu plasma-desktop sddm qt5-base gtk2 gtk3

If that will not work, do it from a USB install and chroot into your installed system.

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