Public bug reported:

After grub crash during Ubuntu 18.04 LTS (Release:      18.04) installation I 
had probably partially installed system.
I have fix problem with grub using boot-repair, but I'm still not able to run 
any Qt application.
I have been trying to deinstall and reinstall Qt libs, and finally stacked on 
this:

borkowsk@wojciech-CELSIUS-7:~$ konsole
This application failed to start because it could not find or load the Qt 
platform plugin "xcb"
in "".

Available platform plugins are: dxcb, eglfs, linuxfb, minimal,
minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-
egl, wayland-xcomposite-glx, xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)
borkowsk@wojciech-CELSIUS-7:~$ krusader
This application failed to start because it could not find or load the Qt 
platform plugin "xcb"
in "".

Available platform plugins are: dxcb, eglfs, linuxfb, minimal,
minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-
egl, wayland-xcomposite-glx, xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

borkowsk@wojciech-CELSIUS-7:~$ xcb &
[1] 2884

borkowsk@wojciech-CELSIUS-7:~$ krusader
This application failed to start because it could not find or load the Qt 
platform plugin "xcb"
in "".

Available platform plugins are: dxcb, eglfs, linuxfb, minimal,
minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-
egl, wayland-xcomposite-glx, xcb.

Reinstalling the application may fix this problem.
Aborted (core dumped)

** Affects: grub-installer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1772900

Title:
  This application failed to start because it could not find or load the
  Qt platform plugin "xcb" in "".

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