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Fixing Curl Symbol Lookup Error in Ubuntu 20.04

Ubuntu 17

In this article, we will address a common issue that Ubuntu 20.04 users may encounter when using curl: the “curl: symbol lookup error”. This error is typically caused by a conflict with the Dell DCA enabler packages, which interfere with the libcurl library that curl uses. We will go through a step-by-step guide on how to permanently fix this issue.

Quick Answer

To fix the "curl: symbol lookup error" in Ubuntu 20.04, you need to remove the Dell DCA enabler packages using the apt-get purge command. Then, check and fix the link to the libcurl.so.4 library. Finally, test curl to ensure the issue is resolved.

Understanding the Curl Symbol Lookup Error

The error message “curl: symbol lookup error: curl: undefined symbol: curl_url_set, version CURL_OPENSSL_4” typically appears when you try to use curl. This error indicates that curl is trying to access a function (curl_url_set) that it expects to find in the libcurl library, but it cannot find it. This is usually due to a version mismatch or conflict with other packages.

Identifying the Source of the Error

The first step to fixing this error is to identify the source of the conflict. In this case, the culprit is usually the Dell DCA enabler packages. You can check if these packages are installed on your system by running the following command:

dpkg -S dcaenabler

This command checks which package owns the /usr/lib/dcaenabler/ directory. If the output indicates a Dell-related package, it is likely the source of the conflict.

Removing the Dell DCA Enabler Packages

Once you’ve identified the Dell DCA enabler packages as the source of the conflict, you can remove them using the apt-get purge command, as shown below:

sudo apt-get purge --autoremove dca-enabler-packages dca-enabler

The purge option in apt-get removes the packages and their configuration files. The --autoremove option removes any dependencies that were installed with the packages and are no longer needed.

Checking the libcurl Library

After removing the Dell DCA enabler packages, you should check that the libcurl.so.4 library is linked correctly. You can do this by running the following command:

ls -ltr /usr/lib/dcaenabler/libcurl*

This command lists the files in the /usr/lib/dcaenabler/ directory that start with libcurl. If the output shows a soft link to the libcurl.so.4.5.0 file, you need to remove this link and create a new one to the correct libcurl.so.4 library.

Fixing the libcurl Library Link

To fix the link to the libcurl.so.4 library, first remove the existing link with the following command:

sudo rm /usr/lib/dcaenabler/libcurl.so.4

Then, create a new link to the correct library using the ln -s command:

sudo ln -s /usr/lib/x86_64-linux-gnu/libcurl.so.4 /usr/lib/dcaenabler/

The ln -s command creates a symbolic link (a type of shortcut) from the first file to the second location. This ensures that when curl looks for the libcurl.so.4 library, it finds the correct version.

Testing the Fix

After fixing the link, you should test curl to see if the issue is resolved. You can do this by running the following command:

curl --version

If curl runs without any errors, the issue should be fixed.

Ensuring the Fix is Permanent

To ensure that the fix survives a reboot, you may need to modify the startup configuration of your system. Check if there are any scripts or configurations related to the Dell DCA enabler packages in /etc/init.d or /etc/systemd/system. If you find any, remove or disable them.

Additionally, make sure that the /usr/lib/dcaenabler/ directory is not recreated after a reboot. If it is, you may need to investigate further to find out why it is being created and prevent it from happening.

By following these steps, you should be able to permanently fix the “curl: symbol lookup error” issue caused by the Dell DCA enabler packages. Remember to backup your system before making any changes and proceed with caution. For further reading and more detailed information about the curl command, you can visit the official curl documentation.

What is the purpose of the Dell DCA enabler packages?

The Dell DCA enabler packages are used to enable Dell’s Data Center Automation (DCA) feature, which provides automated management capabilities for Dell servers.

Can I use curl without removing the Dell DCA enabler packages?

It is not recommended to use curl without removing the Dell DCA enabler packages because the conflict between the packages and libcurl can cause the "curl: symbol lookup error" and other issues.

How can I check if the Dell DCA enabler packages are installed on my system?

You can check if the Dell DCA enabler packages are installed by running the command dpkg -S dcaenabler in the terminal. If it shows a Dell-related package as the owner of the /usr/lib/dcaenabler/ directory, the packages are installed.

Will removing the Dell DCA enabler packages affect other Dell server management features?

Removing the Dell DCA enabler packages should not affect other Dell server management features as they are separate from the curl library. However, it is always a good practice to backup your system before making any changes.

How can I permanently fix the “curl: symbol lookup error” issue?

To permanently fix the "curl: symbol lookup error" issue, you need to remove the Dell DCA enabler packages using the apt-get purge command, fix the link to the libcurl.so.4 library, and ensure that any related scripts or configurations are removed or disabled. Please refer to the article for detailed instructions.

How can I test if the fix for the “curl: symbol lookup error” issue is successful?

You can test if the fix is successful by running the command curl --version in the terminal. If curl runs without any errors, the issue should be resolved.

Is it necessary to modify the startup configuration of my system after fixing the issue?

Modifying the startup configuration may be necessary to ensure that the fix survives a reboot. You should check for any scripts or configurations related to the Dell DCA enabler packages in /etc/init.d or /etc/systemd/system and remove or disable them. Additionally, ensure that the /usr/lib/dcaenabler/ directory is not recreated after a reboot.

Where can I find more information about the curl command?

For further reading and more detailed information about the curl command, you can visit the official curl documentation.

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