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Start by checking which FreeType library the failing process actually loads. Run ldd -r against the exact libQt5XcbQpa.so.5 named in the error, then inspect LD_LIBRARY_PATH and any application-bundled libraries. The error means Qt’s XCB platform library expects the FreeType symbol FT_Property_Set, but the dynamic loader selected an incompatible, incomplete, or inaccessible libfreetype.so.6. Correct that library selection for the affected application; do not delete or rename system libraries based on an anecdote.
What the error means
A message such as libQt5XcbQpa.so.5: undefined symbol: FT_Property_Set is produced at runtime, before the Qt application can finish starting. libQt5XcbQpa.so.5 is Qt’s XCB platform plugin. During loading, it asks FreeType for FT_Property_Set. If another FreeType build is selected, or the intended library cannot be found, the loader cannot resolve the symbol and aborts the process.
Debian reports of the same failure also list FT_Property_Get and FT_Get_Font_Format as unresolved. The same symptom has appeared in qjackctl, VirtualBox, wkhtmltopdf, and applications that ship their own Qt files. Therefore, the program name alone does not identify the fix: the paths and environment of the failing process do.
Fast diagnostic and repair sequence
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Record the exact program and paths
Copy the complete error, including the executable and the absolute path of
libQt5XcbQpa.so.5if one is shown. A system Qt library and a copy inside/opt, an AppImage, or a vendor directory can have very different dependencies. If a wrapper script launches the program, inspect the wrapper rather than assuming the command in your shell is the real executable.Outdated Drivers Are Slowing You Down
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Run the loader’s relocation check
Use the path named by your error. The Debian maintainer’s diagnostic example is:
ldd -r /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5That example path is common on 64-bit Debian-based systems, but it is not universal. Replace it with the path from your host. Look for unresolved symbols and for the line that resolves
libfreetype.so.6. A result such asnot found, or a path in an unexpected application directory, is significant. -
Print the selected FreeType path clearly
Run a normal dependency listing as well:
ldd /path/to/libQt5XcbQpa.so.5 | grep -E 'freetype|not found'Compare the displayed path with the library you intend the application to use. If the path points to an old custom build, an Infinality-era directory, or a vendor bundle, that library may be taking precedence over the distribution copy.
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Check runtime search-path overrides
Print the variable in the same shell or launcher that starts the application:
Special offer. See more information about Outbyte and uninstall instructions. Please review EULA and Privacy policy.printf '%sn' "$LD_LIBRARY_PATH"An entry containing an application directory, an older FreeType installation, or a different architecture can change the result of the loader search. One wkhtmltopdf report was resolved after making the intended
libfreetype.so.6directory available throughLD_LIBRARY_PATH; that is evidence that search-path selection matters, not a universal directory to copy.Rank #2
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Test one controlled change
For a temporary test, put the verified directory first, preserving any entries that the application genuinely needs:
LD_LIBRARY_PATH=/path/to/verified/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH} your-commandAlternatively, test whether an inherited override is the cause:
env -u LD_LIBRARY_PATH your-commandRetest immediately and keep a record of which command changed the result. Do not permanently edit a desktop launcher or system profile until you know which library is correct for this application.
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Handle bundled libraries separately
If the failing Qt file lives under a vendor directory, the program may bundle Qt/XCB while resolving FreeType from the host—or bundle both and accidentally mix versions. Check the launcher, environment files, and nearby
libdirectories. A 2025 forum report involving a bundled FPGA tool demonstrates this pattern. Use the vendor’s supported runtime layout where available; mixing a random system library into a vendor bundle can create a second incompatibility.
Distribution-managed and bundled installations require different decisions
| What you find | Likely issue | Safer next action |
|---|---|---|
| Qt and FreeType both resolve to distribution directories | The installed package set may be inconsistent, or the Qt build may expect a different FreeType ABI. | Verify package ownership and versions with your distribution tools, then repair the specific package set. Reinstalling an unrelated Qt package is not a proven general remedy. |
| Qt resolves to a vendor or application directory; FreeType resolves elsewhere | A bundled Qt stack is being combined with a host FreeType. | Review the vendor launcher and its documented library path. Test a compatible, deliberate path change rather than copying files into system directories. |
| Both Qt and FreeType resolve inside the application bundle | The bundle may contain an older or incomplete FreeType build. | Use the application’s update or repair method, or ask its vendor for a compatible bundle. Avoid replacing one file by hand unless the vendor documents that procedure. |
libfreetype.so.6 is reported as not found |
The loader cannot search the directory containing the required library. | Confirm the file exists and is readable, then correct the application’s runtime path or installation. A temporary LD_LIBRARY_PATH test can confirm the diagnosis. |
On Debian or Ubuntu, package ownership can be checked with dpkg -S /path/to/libfreetype.so.6; on RPM-based systems, the analogous query is commonly rpm -qf /path/to/libfreetype.so.6. Use the command appropriate to your distribution and the actual path printed by ldd.
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Fixes for the common causes
An old or custom FreeType directory wins
Remove that directory from the application’s launcher environment, or move the verified system directory ahead of it for this one command. Do not globally prepend a directory simply because it contains a file with the right name: other programs may require a different ABI. If the setting came from a shell profile, desktop file, wrapper, container, or service unit, change it at that layer and restart the process.
A vendor launcher sets its own environment
Launching the executable from a clean terminal may not reproduce the desktop shortcut’s environment. Compare the command used by the shortcut or script with an interactive launch. If the vendor supplies a setup script, source that script exactly as documented and avoid appending unrelated system library directories. When a bundled application has no supported override, the vendor’s package update is safer than replacing its shared objects.
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After confirming that both libraries come from distribution locations, refresh package metadata and verify the packages that own the Qt XCB plugin and FreeType library. Reinstall only the identified packages, then rerun ldd -r. A Debian discussion records a case where reinstalling libqt5gui5 did not solve the problem, so repeating that operation without checking paths wastes time.
A missing auxiliary package is suspected
A 2017 mailing-list follow-up says installing freetype2-demos helped one user. That is a single anecdote, not a general repair and not evidence that demo programs provide the runtime library your application needs. Treat it as a clue only after dependency resolution and package ownership have been checked.
Application-specific checks
wkhtmltopdf or a Python wrapper
Find the actual binary with command -v wkhtmltopdf, then run ldd -r on its Qt library or inspect the process’s bundled directory. A Python script may inherit LD_LIBRARY_PATH from the shell, service manager, virtual environment, or job runner. Test the same command with and without that variable before changing Python code.
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VirtualBox, qjackctl, or another desktop Qt program
Check whether the desktop launcher injects a library path that your terminal does not. If the program works from one launch method but not another, the difference is usually the environment or executable path. Preserve the launcher-specific variables required by the application while removing only the conflicting FreeType entry.
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A bundled commercial or engineering application
List the Qt and FreeType paths shown for that application’s process, not for a different program on the same machine. Vendor bundles often include private plugin directories and startup scripts. Keep a backup of the original launcher, make one change, and use the vendor’s support channel if the supported bundle still exposes unresolved symbols.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What not to do
- Do not delete, rename, or overwrite
/usr/liblibraries because an online post used a different distribution or application. - Do not assume that the newest-looking FreeType file is compatible with the Qt build that loads it.
- Do not install an unrelated package as a first response; establish the selected path with
ldd -r. - Do not change several variables at once. You need to know whether the fix was a path correction, a package repair, or merely a different launcher.
Verify the repair and keep it reproducible
- Run
ldd -ragain on the exact Qt library and confirm that the FreeType symbols are resolved. - Launch the original command from the environment that previously failed.
- Repeat the launch through the desktop shortcut, service, or Python job that users actually rely on.
- Record the executable path, Qt path, FreeType path, and any required environment setting in the application’s deployment notes.
If the error returns after an application update, rerun the path checks. Updates can replace a bundled Qt directory or alter a wrapper’s search path without changing your system-wide FreeType installation.
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FAQ
Does the symbol name tell me which exact FreeType version to install?
No. The symbol identifies the unresolved interface, not a universal package version. The compatible choice depends on the Qt build, distribution packages, and any bundled libraries, so use the resolved paths and package ownership as your evidence.
Can a screenshot tool repair this loader error?
No. Screenshot software is unrelated to ELF symbol resolution. It can only help you document a web page or error report; the repair must be made in the affected application’s libraries or runtime environment.
Frequently Asked Questions
Does the symbol name tell me which exact FreeType version to install?
No. It identifies the unresolved interface, not a universal package version. Check the Qt build, resolved paths, and package ownership instead.
Can a screenshot tool repair this loader error?
No. Screenshot software cannot change ELF symbol resolution; it is useful only for documenting a web page or report.
Quick Recap
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