Ubuntu 18.4 libQt5Core.so.5: cannot open shared object file: No such file or directory

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?

Solution 1:

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:

https://bbs.archlinux.org/viewtopic.php?id=232682

...

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

Solution 2:

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.

Solution 3:

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.

Solution 4:

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