我想在我的 ubuntu 20.04 上安装 Systemback 并找到了这个页面。当我运行 systemback 时，我收到此错误消息。
ckim@ckim-ubuntu:~$ sudo systemback&
[1] 220231
ckim@ckim-ubuntu:~$ No protocol specified
No protocol specified
qt.qpa.xcb: could not connect to display :2
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, xcb.
我应该安装什么以及如何安装？（fwiw，我正在工作的 Windows 10 机器上的 …