求助：系统进入桌面后一片黑屏，但是CTRL+ALT+DEL可以使用进入系统监视器，后成功打开终端并运行dde-shell报错，最后一段贴出来如下：

2024-12-11, 20:10:08.744 [Warning] [ ] Invalid QML element name "DropIndex"; value type names should begin with a lowercase letter
2024-12-11, 20:10:08.768 [Warning] [ ] Invalid QML element name "AppItem"; value type names should begin with a lowercase letter
2024-12-11, 20:10:08.832 [Debug] [panel.cpp ds::DPanelPrivate::ensurePopupWindow 117] Create PopupWidow successfully.
2024-12-11, 20:10:08.833 [Debug] [panel.cpp ds::DPanelPrivate::ensureToolTipWindow 139] Create ToolTipWindow successfully.
2024-12-11, 20:10:08.833 [Debug] [panel.cpp ds::DPanelPrivate::ensureMenuWindow 161] Create MenuWindow successfully.
2024-12-11, 20:10:08.834 [Debug] [x11dlayershellemulation.cpp ds::LayerShellEmulation::onExclusionZoneChanged 190] update exclusion zone, winId: 100663326 , (left, right, top, bottom) 0 0 0 0
2024-12-11, 20:10:08.835 [Debug] [x11dlayershellemulation.cpp ds::LayerShellEmulation::onExclusionZoneChanged 190] update exclusion zone, winId: 100663326 , (left, right, top, bottom) 0 0 0 48
error: XDG_RUNTIME_DIR is invalid or not set in the environment
2024-12-11, 20:10:08.836 [Fatal] [ ] Fatal: Failed to open server socket: "dockplugin". XDG_RUNTIME_DIR is: ""

看情况是找不到XDG_RUNTIME_DIR设置的环境变量

于是为胡乱设置一个，再运行的dde-shell,桌面壁纸等成功出现，但桌面上什么也没有，开始菜单里也什么也没有。

请问这种问题怎么解决》？