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Fixing “libQt5Core.so.5: cannot open shared object file” error in Ubuntu 18.04 VirtualBox

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In this article, we will delve into the issue of the “libQt5Core.so.5: cannot open shared object file: No such file or directory” error in Ubuntu 18.04 running on VirtualBox and provide comprehensive solutions to fix it. This error typically arises when the system fails to locate the libQt5Core.so.5 library, which is a part of the Qt framework, often used by applications for creating interactive user interfaces.

Solution 1: Reinstall libqt5 Packages

The first solution involves reinstalling the libqt5 packages. Here’s how you can do it:

Step 1: Open a terminal. You can do this by pressing Ctrl + Alt + T on your keyboard.

Step 2: Run the following command:

sudo apt install --reinstall libqt5widgets5 libqt5gui5 libqt5dbus5 libqt5network5 libqt5core5a

The sudo command is used to run the following command with root privileges. The apt install --reinstall command reinstalls the specified packages. In this case, we are reinstalling several libqt5 packages.

Step 3: After the reinstallation, verify if the missing libraries are now present using the following command:

ldd /usr/lib/virtualbox/VirtualBox.so | grep Qt

The ldd command lists the dynamic dependencies of a shared library or executable. The grep Qt part filters the output to only show lines containing ‘Qt’. If the missing libraries are no longer listed, you have successfully resolved the issue.

Solution 2: Manually Strip the ABI Tag

The second solution involves manually stripping the ABI tag. Here’s how to do it:

Step 1: Open a terminal.

Step 2: Run the following command:

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

The strip command is used to discard symbols from object files. The --remove-section=.note.ABI-tag option tells strip to remove the section named ‘.note.ABI-tag’. This command modifies the libQt5Core.so.5 file to make it compatible with your system.

Step 3: Try launching VirtualBox again and check if the error persists.

Solution 3: Check Package Status and File Locations

The third solution involves checking the status of the libqt5 packages and their file locations. Here’s how to do it:

Step 1: Open a terminal.

Step 2: Run the following command:

dpkg -l | grep libqt5

The dpkg -l command lists all installed packages, and the grep libqt5 part filters the output to only show lines containing ‘libqt5’. The properly installed packages should have the status “ii”.

Step 3: If the packages are installed but the files are not found in the expected location, it could indicate an installation issue. Verify the installation method and try reinstalling the packages using the appropriate method.

Step 4: You can also use the locate command to search for the missing files, although this is unlikely to be necessary if you installed them manually.

These solutions should help resolve the “libQt5Core.so.5: cannot open shared object file: No such file or directory” error on Ubuntu 18.04. Remember, always ensure to run commands with sudo if required to avoid permission issues.

What is the purpose of the libQt5Core.so.5 library?

The libQt5Core.so.5 library is a part of the Qt framework, which is commonly used by applications to create interactive user interfaces. It provides essential functions and features for GUI development in various programming languages.

Why am I getting the “libQt5Core.so.5: cannot open shared object file: No such file or directory” error?

This error occurs when the system fails to locate the libQt5Core.so.5 library. It could be due to missing or corrupted library files, incorrect installation, or compatibility issues between the library and your system.

How can I reinstall the libqt5 packages?

To reinstall the libqt5 packages, open a terminal and run the command sudo apt install --reinstall libqt5widgets5 libqt5gui5 libqt5dbus5 libqt5network5 libqt5core5a. This command will reinstall the specified libqt5 packages on your system.

What does the `ldd /usr/lib/virtualbox/VirtualBox.so | grep Qt` command do?

The ldd /usr/lib/virtualbox/VirtualBox.so | grep Qt command lists the dynamic dependencies of the VirtualBox.so shared library file and filters the output to show only the lines containing ‘Qt’. This command helps to verify if the missing Qt libraries are now present after reinstalling the libqt5 packages.

How can I manually strip the ABI tag?

To manually strip the ABI tag, open a terminal and run the command strip --remove-section=.note.ABI-tag /usr/lib/x86_64-linux-gnu/libQt5Core.so.5. This command modifies the libQt5Core.so.5 file by removing the section named ‘.note.ABI-tag’, making it compatible with your system.

How can I check the status of the libqt5 packages and their file locations?

To check the status of the libqt5 packages and their file locations, open a terminal and run the command dpkg -l | grep libqt5. This command lists all installed packages and filters the output to show only the lines containing ‘libqt5’. The properly installed packages should have the status "ii".

What should I do if the libqt5 packages are installed but the files are not found in the expected location?

If the packages are installed but the files are not found in the expected location, it could indicate an installation issue. Verify the installation method and try reinstalling the packages using the appropriate method. You can also use the locate command to search for the missing files, although this is unlikely to be necessary if you installed them manually.

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