Software & AppsOperating SystemLinux

How To Install libqt4-dev on Focal: Package Not Available Error Solution

Ubuntu 16

If you’re trying to install libqt4-dev on Ubuntu Focal and have encountered the “Package Not Available” error, you’re not alone. This issue arises because the libqt4-dev package is not available in the Ubuntu Focal repository, despite appearing in Launchpad. This could be because QT4 has been dropped from newer releases of Ubuntu, including Focal. However, don’t worry, there are a few possible solutions to this problem.

Understanding the Problem

The libqt4-dev package is a development files for Qt 4 library. It’s a necessary package for some software, but unfortunately, it’s not available in the newer Ubuntu versions. This is because the QT4 has been superseded by QT5, and the Ubuntu team has decided to drop the older version from their repositories.

Solution 1: Use an Older Release of Ubuntu

One of the simplest solutions to this problem is to use an older release of Ubuntu. Ubuntu 18.04, for example, still has the full QT4 stack in its repositories. You can download Ubuntu 18.04 from the official Ubuntu website here.

To install libqt4-dev on Ubuntu 18.04, you can use the following command:

sudo apt-get install libqt4-dev

In this command, sudo is used to run the command with root privileges, apt-get is the package handling utility in Ubuntu, install is the command to install a package, and libqt4-dev is the name of the package.

Solution 2: File a Bug Report

If the software you’re trying to use is still actively maintained and requires libqt4-dev, you can file a bug report with the upstream developers. They may be able to provide a solution or update the software to work with newer versions of QT.

You can usually find the option to file a bug report on the software’s official website or GitHub page.

Solution 3: Use QT5

Since QT4 has been superseded by QT5, you could try installing libqt5-dev instead. To do this, you can use the following command:

sudo apt-get install libqt5-dev

However, please note that this might not work for all software, as some might specifically require QT4. In this case, you may need to investigate further or seek assistance from the software’s community or developers.

Conclusion

While the unavailability of libqt4-dev on Ubuntu Focal can be frustrating, there are a few potential solutions to this problem. Whether you decide to use an older Ubuntu version, file a bug report, or try using QT5, it’s important to understand the underlying issue and choose the solution that best fits your specific situation.

Remember, the availability of packages can vary depending on the Ubuntu release and the specific software requirements. Always ensure to check the software’s documentation for any specific dependencies and their versions.

Why is libqt4-dev not available in Ubuntu Focal?

The libqt4-dev package is not available in Ubuntu Focal because QT4 has been dropped from newer releases of Ubuntu, including Focal. The Ubuntu team has decided to focus on the newer version, QT5, and has removed the older version from their repositories.

Can I still use libqt4-dev on Ubuntu Focal?

While libqt4-dev is not available in the Ubuntu Focal repository, you can still use an older release of Ubuntu, such as Ubuntu 18.04, which has the full QT4 stack in its repositories. Alternatively, you can consider filing a bug report with the upstream developers or exploring the possibility of using libqt5-dev instead.

How can I install libqt4-dev on Ubuntu 18.04?

To install libqt4-dev on Ubuntu 18.04, you can use the following command: sudo apt-get install libqt4-dev. This command will install the libqt4-dev package using the apt-get package handling utility with root privileges.

What should I do if the software I’m using requires libqt4-dev?

If the software you’re using requires libqt4-dev and is still actively maintained, you can consider filing a bug report with the upstream developers. They may be able to provide a solution or update the software to work with newer versions of QT. You can usually find the option to file a bug report on the software’s official website or GitHub page.

Can I use libqt5-dev instead of libqt4-dev?

In some cases, you may be able to use libqt5-dev instead of libqt4-dev. You can try installing libqt5-dev using the command sudo apt-get install libqt5-dev. However, please note that this may not work for all software, as some might specifically require QT4. It’s important to check the software’s documentation or seek assistance from the software’s community or developers to determine the compatibility of libqt5-dev with your specific software requirements.

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