问题遇到的现象和发生背景
想用DocHub文库系统，Ubuntu20.04环境下安装calibre,然后装好运行出问题，转化文档不成功，检查是QT xcb异常，不知道如何解决
问题相关代码，请勿粘贴截图
root@iZj6c8ykfr7lcu292ua4izZ:~# calibre
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
root@iZj6c8ykfr7lcu292ua4izZ:~#
运行结果及报错内容
我的解答思路和尝试过的方法
我想要达到的结果
想哪位有经验的看有好方法解决，不甚感激
