Thanks, the installation of the libertine-scope also made my desktop apps visible. I can launch Gedit, for example.
However, I cannot launch LibreOffice. In fact, I see the LibreOffice splash screen, but then there is following error message:
"The application cannot be started.
[context = "user"] caught unexpected
com.sun.star.ucb.ContentCreationException:
Cannot create folder (invalid path):"
Do you have any idea how I can fix that? Thanks in advance.