Public bug reported:

$ deepin-screenshot
qt.qpa.plugin: Could not load the Qt platform plugin "dxcb" 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: wayland-org.kde.kwin.qpa, dxcb, eglfs,
linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland,
wayland-xcomposite-egl, wayland-xcomposite-glx, xcb.

$ dpkg -S /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libdxcb.so
qt5dxcb-plugin:amd64: /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libdxcb.so

$ LD_PRELOAD=/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libdxcb.so 
deepin-screenshot
deepin-screenshot: symbol lookup error: 
/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libdxcb.so: undefined symbol: 
_ZN22deepin_platform_plugin15WindowEventHook11windowEventEP6QEvent

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: qt5dxcb-plugin 1.1.22-1ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
Uname: Linux 5.0.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Apr 27 09:25:01 2019
InstallationDate: Installed on 2017-08-28 (606 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
SourcePackage: deepin-qt5dxcb-plugin
UpgradeStatus: Upgraded to disco on 2018-02-08 (442 days ago)
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2018-07-03T12:21:32.224223

** Affects: deepin-qt5dxcb-plugin (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco third-party-packages

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https://bugs.launchpad.net/bugs/1826629

Title:
  deepin-screenshot: can't find dxcb Qt plugin

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