After doing a fresh install of Ubuntu 18.04 (using gnome), I installed virtualbox both through sudo apt-get install virtualbox

However, when I run it from the command line I get:

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

I tried providing further info, as already suggested here: Virtualbox not starting

When I checked for Qt libs, I can see that they are properly installed since they have ii status.

dpkg -l | grep libqt5



ii  libqt5concurrent5:amd64                    5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 concurrent module

ii  libqt5core5a:amd64                         5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 core module

ii  libqt5dbus5:amd64                          5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 D-Bus module

ii  libqt5gui5:amd64                           5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 GUI module

ii  libqt5network5:amd64                       5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 network module

ii  libqt5opengl5:amd64                        5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 OpenGL module

ii  libqt5opengl5-dev:amd64                    5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 OpenGL library development files

ii  libqt5printsupport5:amd64                  5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 print support module

ii  libqt5sql5:amd64                           5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 SQL module

ii  libqt5sql5-sqlite:amd64                    5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 SQLite 3 database driver

ii  libqt5svg5:amd64                           5.9.5-0ubuntu1                      amd64        Qt 5 SVG module

ii  libqt5test5:amd64                          5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 test module

ii  libqt5widgets5:amd64                       5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 widgets module

ii  libqt5x11extras5:amd64                     5.9.5-0ubuntu1                      amd64        Qt 5 X11 extras

ii  libqt5x11extras5-dev:amd64                 5.9.5-0ubuntu1                      amd64        Qt 5 X11 extras development files

ii  libqt5xml5:amd64                           5.9.5+dfsg-0ubuntu1                 amd64        Qt 5 XML module

However, the following libraries are not found:

ldd /usr/lib/virtualbox/VirtualBox.so | grep not



libQt5Core.so.5 => not found

libQt5Gui.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

libQt5Widgets.so.5 => not found

libQt5Gui.so.5 => not found

libQt5Core.so.5 => not found

Same here:

ldd /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 | grep not

ldd: /usr/lib/x86_64-linux-gnu/libQt5Core.so.5: No such file or directory

Also:

dpkg -S /usr/bin/virtualbox

virtualbox-qt: /usr/bin/virtualbox

I then did a further search regarding Qt and reached this thread, but the solution doesn't work either:Ubuntu 18.4 libQt5Core.so.5: cannot open shared object file: No such file or directory

You can also see where the library files are pointing to:

ls -alht /usr/lib/x86_64-linux-gnu/libQt5*

lrwxrwxrwx 1 root root   24 Apr 14 21:31 /usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5 -> libQt5X11Extras.so.5.9.5

lrwxrwxrwx 1 root root   24 Apr 14 21:31 /usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5.9 -> libQt5X11Extras.so.5.9.5

-rw-r--r-- 1 root root  15K Apr 14 21:31 /usr/lib/x86_64-linux-gnu/libQt5X11Extras.so.5.9.5

lrwxrwxrwx 1 root root   18 Apr 14 21:23 /usr/lib/x86_64-linux-gnu/libQt5Svg.so.5 -> libQt5Svg.so.5.9.5

lrwxrwxrwx 1 root root   18 Apr 14 21:23 /usr/lib/x86_64-linux-gnu/libQt5Svg.so.5.9 -> libQt5Svg.so.5.9.5

-rw-r--r-- 1 root root 342K Apr 14 21:23 /usr/lib/x86_64-linux-gnu/libQt5Svg.so.5.9.5

lrwxrwxrwx 1 root root   25 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Concurrent.so.5 -> libQt5Concurrent.so.5.9.5

lrwxrwxrwx 1 root root   25 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Concurrent.so.5.9 -> libQt5Concurrent.so.5.9.5

-rw-r--r-- 1 root root  27K Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Concurrent.so.5.9.5

lrwxrwxrwx 1 root root   37 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5EglFSDeviceIntegration.so.5 -> libQt5EglFSDeviceIntegration.so.5.9.5

lrwxrwxrwx 1 root root   37 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5EglFSDeviceIntegration.so.5.9 -> libQt5EglFSDeviceIntegration.so.5.9.5

-rw-r--r-- 1 root root 714K Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5EglFSDeviceIntegration.so.5.9.5

lrwxrwxrwx 1 root root   30 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5EglFsKmsSupport.so.5 -> libQt5EglFsKmsSupport.so.5.9.5

lrwxrwxrwx 1 root root   30 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5EglFsKmsSupport.so.5.9 -> libQt5EglFsKmsSupport.so.5.9.5

-rw-r--r-- 1 root root  96K Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5EglFsKmsSupport.so.5.9.5

lrwxrwxrwx 1 root root   18 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5 -> libQt5Gui.so.5.9.5

lrwxrwxrwx 1 root root   18 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.9 -> libQt5Gui.so.5.9.5

-rw-r--r-- 1 root root 5.4M Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5.9.5

lrwxrwxrwx 1 root root   21 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5 -> libQt5OpenGL.so.5.9.5

lrwxrwxrwx 1 root root   21 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5.9 -> libQt5OpenGL.so.5.9.5

-rw-r--r-- 1 root root 346K Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5OpenGL.so.5.9.5

lrwxrwxrwx 1 root root   27 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so.5 -> libQt5PrintSupport.so.5.9.5

lrwxrwxrwx 1 root root   27 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so.5.9 -> libQt5PrintSupport.so.5.9.5

-rw-r--r-- 1 root root 443K Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5PrintSupport.so.5.9.5

lrwxrwxrwx 1 root root   18 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Sql.so.5 -> libQt5Sql.so.5.9.5

lrwxrwxrwx 1 root root   18 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Sql.so.5.9 -> libQt5Sql.so.5.9.5

-rw-r--r-- 1 root root 292K Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Sql.so.5.9.5

lrwxrwxrwx 1 root root   19 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Test.so.5 -> libQt5Test.so.5.9.5

lrwxrwxrwx 1 root root   19 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Test.so.5.9 -> libQt5Test.so.5.9.5

-rw-r--r-- 1 root root 217K Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Test.so.5.9.5

lrwxrwxrwx 1 root root   22 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 -> libQt5Widgets.so.5.9.5

lrwxrwxrwx 1 root root   22 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.9 -> libQt5Widgets.so.5.9.5

-rw-r--r-- 1 root root 6.3M Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5.9.5

lrwxrwxrwx 1 root root   21 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5 -> libQt5XcbQpa.so.5.9.5

lrwxrwxrwx 1 root root   21 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.9 -> libQt5XcbQpa.so.5.9.5

-rw-r--r-- 1 root root 1.1M Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5.9.5

lrwxrwxrwx 1 root root   18 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Xml.so.5 -> libQt5Xml.so.5.9.5

lrwxrwxrwx 1 root root   18 Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Xml.so.5.9 -> libQt5Xml.so.5.9.5

-rw-r--r-- 1 root root 240K Apr 13 00:24 /usr/lib/x86_64-linux-gnu/libQt5Xml.so.5.9.5

Any help?

Thanks cmak.fr for pointing me towards the solution. I had to reinstall the the libqt5core5a and libdouble-conversion1 packages. Note that this also removed virtualbox-qt, which had to be reinstalled:

sudo apt-get remove libqt5core5a

sudo apt-get install libqt5core5a



sudo apt-get remove libdouble-conversion1

sudo apt-get install libdouble-conversion1



sudo apt-get install virtualbox-qt

At the end, one can check with ldd /usr/lib/x86_64-linux-gnu/libQt5Core.so.5 to see if there are other missing dependencies. If there are, try finding the corresponding package names and reinstall them.

Just to add information, these are the steps I have followed:

# Attempt to run virtualbox from terminal 

$> virtualbox



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



Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.



Reinstalling the application may fix this problem.

Aborted (core dumped)

Finding the path to the executable

$> which virtualbox



/usr/bin/virtualbox

Find a Program's Shared Libraries

$> ldd /usr/bin/virtualbox

not a dynamic executable

Use strace

$> strace  /usr/bin/virtualbox

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

in "**/usr/lib/x86_64-linux-gnu/qt5/plugins/platforms**".



Available platform plugins are:....{ many plugins here }

The Next thing I did (as suggested from another site) was:

#>vim /etc/ld.so.conf.d/libc.conf

# libc default configuration

#/usr/local/lib         # comment it out this line

Then issue the following to update the library cache.

#> sudo ldconfig

Then try to run VirtualBox again from the terminal

$> virtualbox

{{Finally Works!!!}

Hope this helps to fix your Virtualbox. Not sure if I have to uncomment the line /usr/local/lib from above.

Yes, I did uncomment the line

/usr/local/lib # comment it out this line

and everything continues to work fine. I did a reboot to do clean check all is well.

Cheers

In my case (fresh Ubuntu 18.10 install) ldd showed that only libQt5Widgets.so.5 was missing, and running virtualbox would show something like this:

VirtualBox: supR3HardenedMainGetTrustedMain: dlopen("/usr/lib/virtualbox/VirtualBox.so",) failed: libQt5Widgets.so.5: cannot open shared object file: No such file or directory

So it was pretty close to OP's error. So I had to:

sudo apt install --reinstall libqt5widgets5

But then I had an error pretty similar to one of above in this thread:

Qt FATAL: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.



Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, xcb.



Aborted (core dumped)

After rising debug level with :

export QT_DEBUG_PLUGINS=1

It showed that I had to install another two missing dependencies:

sudo apt install --reinstall libqt5dbus5

sudo apt install --reinstall libxcb-xinerama0