我突然无法启动 Kubuntu，昨天我没有对我的系统做任何奇怪的事情，突然它无法启动，卡在主板徽标上。我已经发现当我按 alt+f2 时我可以进入终端，似乎 plasmashell 不想启动，当我尝试启动它时，我收到错误：
qt.qpa.xcb could not connect to display.
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
Available platform plugins are: eglfs, linuxfb, minimal, minimallegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb
fish: Job 1, 'plasmashell' terminated by signal SIGABRT (Abort)
有人能帮忙吗？我在 Google 上搜索过并尝试了一些方法，但遗憾的是没有效果。
我以前遇到过这种情况，并通过恢复备份解决了这个问题，但我不想继续恢复备份来保持系统正常运行