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

[Wojciech Borkowski]

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)

[Wojciech Borkowski (wborkowsk)]

Reinstallation did not help anymore:

sudo apt --reinstall install krusader

Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 3 434 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://pl.archive.ubuntu.com/ubuntu bionic/universe amd64 krusader amd64 2:2.6.0-1 [3 434 kB]
Fetched 3 434 kB in 0s (8 174 kB/s)
(Reading database ... 250895 files and directories currently installed.)
Preparing to unpack .../krusader_2%3a2.6.0-1_amd64.deb ...
Unpacking krusader (2:2.6.0-1) over (2:2.6.0-1) ...
Setting up krusader (2:2.6.0-1) ...
Processing triggers for mime-support (3.60ubuntu1) ...
Processing triggers for desktop-file-utils (0.23-1ubuntu3) ...
Processing triggers for man-db (2.8.3-2) ...
Processing triggers for gnome-menus (3.13.3-11ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.17-2) ...
[1]+ Done xcb
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)

[Wojciech Borkowski (wborkowsk)]

Looking at any solution I find similar error for VirtualBox:
https://www.virtualbox.org/ticket/17425?cversion=0&cnum_hist=3

and I use similar solution with success!

borkowsk@wojciech-CELSIUS-7:~$ ldd /usr/lib/virtualbox/*.so | grep "not found"
borkowsk@wojciech-CELSIUS-7:~$ ldd /usr/lib/virtualbox/components/*.so | grep "not found"
borkowsk@wojciech-CELSIUS-7:~$ ldd /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so | grep "not found"
 libxcb-xinerama.so.0 => not found
borkowsk@wojciech-CELSIUS-7:~$ ldd /usr/lib/virtualbox/*.so | grep "not"
borkowsk@wojciech-CELSIUS-7:~$ sudo apt --reinstall install libxcb
...

borkowsk@wojciech-CELSIUS-7:~$ konsole &
borkowsk@wojciech-CELSIUS-7:~$ krusader
Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/16/"
Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/22/"
Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/24/"
Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/32/"
Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/48/"
Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/64/"
Invalid Context= "stock" line for icon theme: "/usr/share/icons/ubuntu-mono-dark/stock/128/"
kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp"
kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp"
kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp"
kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp"
kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp"
kf5.kio.core: Refilling KProtocolInfoFactory cache in the hope to find "mtp"

Still krusader have some warnings but now it can start!

[Wojciech Borkowski (wborkowsk)]

Yes, looks like that

On 15.06.2018 16:38, Phillip Susi wrote:
> *** This bug is a duplicate of bug 1607687 ***
> https://bugs.launchpad.net/bugs/1607687
>
> ** This bug has been marked a duplicate of bug 1607687
> various packages show as installed, but files are not present
>

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.