Wie man CMake 'The imported target "Qt6::lconvert" references the file /usr/lib/qt6/bin/lconvert ...' auf Ubuntu behebt

CMake Error at /usr/lib/x86_64-linux-gnu/cmake/Qt6LinguistTools/Qt6LinguistToolsTargets.cmake:131 (message):
  The imported target "Qt6::lconvert" references the file

     "/usr/lib/qt6/bin/lconvert"

  but this file does not exist.  Possible reasons include:

  * The file was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and contained

     "/usr/lib/x86_64-linux-gnu/cmake/Qt6LinguistTools/Qt6LinguistToolsTargets.cmake"

  but not all the files it references.

Call Stack (most recent call first):
  /usr/lib/x86_64-linux-gnu/cmake/Qt6LinguistTools/Qt6LinguistToolsConfig.cmake:47 (include)
  /usr/lib/x86_64-linux-gnu/cmake/Qt6/Qt6Config.cmake:219 (find_package)
  cMake/FreeCAD_Helpers/SetupQt.cmake:33 (find_package)
  CMakeLists.txt:82 (include)