I have Ubuntu 18.04.

While launching virtual box I am getting an error

$ virtualbox
VirtualBox: supR3HardenedMainGetTrustedMain: dlopen("/usr/lib/virtualbox/VirtualBox.so",) failed: libQt5Core.so.5: cannot open shared object file: No such file or directory

$ ldd /usr/lib/virtualbox/VirtualBox.so | grep Qt
libQt5X11Extras.so.5 => /usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5 (0x00007f7dcec8e000)
libQt5Core.so.5 => not found
libQt5Gui.so.5 => not found
libQt5Widgets.so.5 => not found
libQt5PrintSupport.so.5 => /usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so.5 (0x00007f7dcea1f000)
libQt5OpenGL.so.5 => /usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5 (0x00007f7dce7c8000)
libQt5Gui.so.5 => not found
libQt5Core.so.5 => not found
libQt5Widgets.so.5 => not found
libQt5Gui.so.5 => not found
libQt5Core.so.5 => not found
libQt5Widgets.so.5 => not found
libQt5Gui.so.5 => not found
libQt5Core.so.5 => not found

$ apt-file search libQt5Gui.so.5
libqt5gui5: /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
libqt5gui5: /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.9
libqt5gui5: /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.9.5

The system has libqt5* packages but I cannot list some of them using

$ ls /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
ls: cannot access '/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5': No such file or directory

How can I fix this?


5 Answers 5


For me, the libqt5gui5 package was already installed. I tried reinstalling like in the other answer, but still got the error:

ImportError: libQt5Core.so.5: cannot open shared object file: No such file or directory

I found a similar problem at https://github.com/dnschneid/crouton/wiki/Fix-error-while-loading-shared-libraries:-libQt5Core.so.5

The kernel needs to be at least 3.15 for a very real but (to me) esoteric reason: "Qt 5.10 uses the renameat2 system call which is only available since kernel 3.15". If you want to read a very long thread, look here:



sudo strip --remove-section=.note.ABI-tag /usr/lib64/libQt5Core.so.5

The above command "strips out" a piece of code which is looking in the kernel for something not there, and allows the module to load.

I'm actually running Debian testing (bullseye) 3.12-1-amd64. The path to my library is /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5 so the command in my case is

strip --remove-section=.note.ABI-tag /usr/lib/x86_64-linux-gnu/libQt5Core.so.5

After that, I was able to get the app (Electrum) working

  • 8
    I had to run it with sudo command on Ubuntu 20.x and it worked like a charm.
    – nick-s
    Apr 20, 2020 at 23:50
  • 13
    this even worked on WSL running Debian bullseye with kernel 4.4.0
    – elig
    Jun 22, 2020 at 0:55
  • 5
    Yeah, strip does the work in WSL. I used Calibre to convert epub to mobi and fased with problem... See official report: github.com/microsoft/WSL/issues/3023
    – gavenkoa
    Aug 15, 2020 at 19:30
  • 1
    Thank you!!! This made my day, also running on WSL debian 10, kernel: 4.4.0-19041-Microsoft
    – ph_0
    Oct 8, 2020 at 16:23
  • 1
    worked like a charm on wsl. +1
    – ariaman5
    Apr 29, 2021 at 17:35

For all the "not found" libraries, identify their package as you have done with apt-file search for libQt5Gui.so.5. Then install the packages with sudo apt-get install,for example:

sudo apt-get install libqt5gui5

The installation of the packages should put the libraries in the proper location so they will be found.

If files are not present, either they were installed in the wrong place (manually forced somewhere), they are the wrong architecture (i386 instead of amd64, so would be in /usr/lib/i386-linux-gnu), or the installation did not run properly (check the status of the packages with the command:

dpkg -l | grep libqt5  

The properly installed packages will have status "ii".

You could use the locate command to find the file(s) if they are somewhere else on the system, but if you installed them, that possibility is not likely.

  • I have installed all the libqt5* packages but i can not find them on the location
    – jobycxa
    May 10, 2018 at 12:14
  • Please see the below commands for clarification # dpkg -l | grep libqt5gui5 ii libqt5gui5:amd64 5.9.5+dfsg-0ubuntu1 amd64 Qt 5 GUI module
    – jobycxa
    May 11, 2018 at 0:39
  • You can add such info to your original question. So it's installed, but not in the expected location. How did you install? Can you reinstall? Is anything present in /usr/lib/x86_64-linux-gnu (since the error might be a missing directory)?
    – ubfan1
    May 11, 2018 at 1:05

Try reinstall all libqt5 packages. It helped me in similar case:

sudo apt install --reinstall libqt5widgets5 libqt5gui5 libqt5dbus5 libqt5network5 libqt5core5a

After reinstalling ldd $(which qbittorrent) displayed all library .so files in their places.

  • 2
    not solved in my case
    – thanos.a
    May 31, 2020 at 15:11
  • Which libraries are still missing in ldd output?
    – Envek
    Jun 2, 2020 at 10:17
  • After installing the libraries you mentioned I still got the same error "ls: cannot access '/usr/lib/x86_64-linux-gnu/libQt5Gui.so.5': No such file or directory". The I switched to sqlitebrowser in windows so currently I am unable to reproduce it.
    – thanos.a
    Jun 2, 2020 at 10:19
  • This is weird: dpkg --search /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 says that this file is owned by libqt5gui5 package. Please make sure that libqt5gui5 is actually installed.
    – Envek
    Jun 2, 2020 at 14:58
  • I am missing the libQt5Core.so.5 not the libqt5Gui.so.5. Here you are: paste.ofcode.org/utGtYmtGfTGwbyPGD4haEQ it is the libQt5Core.so.5
    – thanos.a
    Jun 2, 2020 at 15:12

Installed dependency to fix this issue.

You might want to run sudo apt --fix-broken install to correct these errors:

The following packages have unmet dependencies:
 virtualbox-6.1 : Depends: libqt5opengl5 (>= 5.0.2) but it is not going to be installed
                  Depends: libqt5x11extras5 (>= 5.6.0) but it is not going to be installed
                  Depends: libsdl1.2debian (>= 1.2.11) but it is not going to be installed
                  Recommends: libsdl-ttf2.0-0 but it is not going to be installed

I have working solution. Choose and download .deb package for your distribution from Official site: https://wkhtmltopdf.org/downloads.html

Next, my steps for Ubuntu 20.04:

  1. wget https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.focal_amd64.deb
  2. sudo apt --fix-broken install ./wkhtmltox_0.12.6-1.focal_amd64.deb

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