我使用的是 Linux Mint 20.1 Cinnamon，内核版本为 5.4.0-97-generic。当我尝试从终端或开始菜单打开 okular 时，我遇到了最近的问题。
Maximum number of clients reachedqt.qpa.xcb: could not connect to display :0
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, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.
Aborted (core dumped)
这方面存在很多问题，但没有提供具体的解决方案。有什么帮助吗？