title: Could not load the Qt platform plugin "xcb"
body: <p>I was running a code from yolact which requires cv2 qt. I encounter the following error.</p>
  <blockquote>
  <p>qt.qpa.plugin: Could not load the Qt platform plugin &quot;xcb&quot; in
  &quot;/home/zhengjie/anaconda3/envs/yolact-env/lib/python3.7/site-packages/cv2/qt/plugins&quot;
  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.</p>
  <p>Available platform plugins are: xcb, eglfs, linuxfb, minimal,
  minimalegl, offscreen, vnc, wayland-egl, wayland,
  wayland-xcomposite-egl, wayland-xcomposite-glx, webgl.</p>
  </blockquote>
  <p>Within the directory of</p>
  <blockquote>
  <p>/home/zhengjie/anaconda3/envs/yolact-env/lib/python3.7/site-packages/cv2/qt/plugins</p>
  </blockquote>
  <p>I find the file: <code>libqxcb.so</code> I have tried re-installing qt but it does not work. Any help would be appreciated.</p>