new situations, now. I have installed nvidia 580 driver.
and this is the log file when kde failed:
6月 19 14:31:50 debian systemd[1219]: Starting plasma-kwin_x11.service - KDE Window Manager...
6月 19 14:31:50 debian systemd[1219]: Starting plasma-plasmashell.service - KDE Plasma Workspace...
6月 19 14:31:50 debian systemd[1219]: Started plasma-kwin_x11.service - KDE Window Manager.
6月 19 14:31:50 debian plasmashell[1468]: kf.svg: Could not locate KSvg image set "breeze-dark" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:50 debian plasmashell[1468]: kf.svg: Could not locate KSvg image set "default" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:50 debian plasmashell[1468]: kf.plasma.core: Could not locate plasma theme "breeze-dark" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:50 debian plasmashell[1468]: kf.plasma.core: Could not locate plasma theme "default" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:50 debian plasmashell[1468]: kf.svg: Could not locate KSvg image set "breeze-dark" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:50 debian plasmashell[1468]: kf.svg: Could not locate KSvg image set "default" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:50 debian plasmashell[1468]: kf.plasma.core: Could not locate plasma theme "breeze-dark" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:50 debian plasmashell[1468]: kf.plasma.core: Could not locate plasma theme "default" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:50 debian plasmashell[1468]: starting invalid corona "org.kde.plasma.desktop"
6月 19 14:31:50 debian systemd[1219]: plasma-plasmashell.service: Main process exited, code=exited, status=1/FAILURE
6月 19 14:31:50 debian systemd[1219]: plasma-plasmashell.service: Failed with result 'exit-code'.
6月 19 14:31:50 debian systemd[1219]: Failed to start plasma-plasmashell.service - KDE Plasma Workspace.
6月 19 14:31:51 debian systemd[1219]: plasma-plasmashell.service: Scheduled restart job, restart counter is at 1.
6月 19 14:31:51 debian systemd[1219]: Starting plasma-plasmashell.service - KDE Plasma Workspace...
6月 19 14:31:51 debian plasmashell[1542]: kf.svg: Could not locate KSvg image set "breeze-dark" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian plasmashell[1542]: kf.svg: Could not locate KSvg image set "default" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian plasmashell[1542]: kf.plasma.core: Could not locate plasma theme "breeze-dark" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian plasmashell[1542]: kf.plasma.core: Could not locate plasma theme "default" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian plasmashell[1542]: kf.svg: Could not locate KSvg image set "breeze-dark" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian plasmashell[1542]: kf.svg: Could not locate KSvg image set "default" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian plasmashell[1542]: kf.plasma.core: Could not locate plasma theme "breeze-dark" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian plasmashell[1542]: kf.plasma.core: Could not locate plasma theme "default" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian plasmashell[1542]: starting invalid corona "org.kde.plasma.desktop"
6月 19 14:31:51 debian systemd[1219]: plasma-plasmashell.service: Main process exited, code=exited, status=1/FAILURE
6月 19 14:31:51 debian systemd[1219]: plasma-plasmashell.service: Failed with result 'exit-code'.
6月 19 14:31:51 debian systemd[1219]: Failed to start plasma-plasmashell.service - KDE Plasma Workspace.
6月 19 14:31:51 debian kwin_x11[1454]: kf.svg: Could not locate KSvg image set "breeze-dark" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian kwin_x11[1454]: kf.svg: Could not locate KSvg image set "default" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian kwin_x11[1454]: kf.plasma.core: Could not locate plasma theme "breeze-dark" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian kwin_x11[1454]: kf.plasma.core: Could not locate plasma theme "default" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:51 debian systemd[1219]: plasma-plasmashell.service: Scheduled restart job, restart counter is at 2.
6月 19 14:31:51 debian systemd[1219]: Starting plasma-plasmashell.service - KDE Plasma Workspace...
6月 19 14:31:51 debian kwin_x11[1454]: kf.config.core: "\"fsrestore1\" - conversion of \"0,0,0,0\" to QRect failed"
6月 19 14:31:51 debian kwin_x11[1454]: kf.config.core: "\"fsrestore2\" - conversion of \"0,0,0,0\" to QRect failed"
6月 19 14:31:51 debian kwin_x11[1454]: kf.config.core: "\"fsrestore3\" - conversion of \"0,0,0,0\" to QRect failed"
6月 19 14:31:51 debian kwin_x11[1454]: kf.config.core: "\"fsrestore4\" - conversion of \"0,0,0,0\" to QRect failed"
6月 19 14:31:52 debian plasmashell[1642]: kf.svg: Could not locate KSvg image set "breeze-dark" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:52 debian plasmashell[1642]: kf.svg: Could not locate KSvg image set "default" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:52 debian plasmashell[1642]: kf.plasma.core: Could not locate plasma theme "breeze-dark" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:52 debian plasmashell[1642]: kf.plasma.core: Could not locate plasma theme "default" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:52 debian plasmashell[1642]: kf.svg: Could not locate KSvg image set "breeze-dark" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:52 debian plasmashell[1642]: kf.svg: Could not locate KSvg image set "default" in "plasma/desktoptheme/" using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:52 debian plasmashell[1642]: kf.plasma.core: Could not locate plasma theme "breeze-dark" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:52 debian plasmashell[1642]: kf.plasma.core: Could not locate plasma theme "default" in plasma/desktoptheme/ using search path QList("/home/steiner/.local/share", "/var/lib/flatpak/exports/share", "/home/steiner/.local/share/flatpak/exports/share")
6月 19 14:31:52 debian plasmashell[1642]: starting invalid corona "org.kde.plasma.desktop"
6月 19 14:31:52 debian systemd[1219]: plasma-plasmashell.service: Main process exited, code=exited, status=1/FAILURE
6月 19 14:31:52 debian systemd[1219]: plasma-plasmashell.service: Failed with result 'exit-code'.
6月 19 14:31:52 debian systemd[1219]: Failed to start plasma-plasmashell.service - KDE Plasma Workspace.
6月 19 14:31:52 debian systemd[1219]: plasma-plasmashell.service: Scheduled restart job, restart counter is at 3.
6月 19 14:31:52 debian systemd[1219]: plasma-plasmashell.service: Start request repeated too quickly.
6月 19 14:31:52 debian systemd[1219]: plasma-plasmashell.service: Failed with result 'exit-code'.
6月 19 14:31:52 debian systemd[1219]: Failed to start plasma-plasmashell.service - KDE Plasma Workspace.
I notice that I have every delete the plasma config, and try reinstalling and purge plasma-desktop, but there is no such ~/.local/share/plasma* file or directory.
so I think this is the problem, I can figure it now 