Hello, I tried to install Olympe and Sphinx but I got some problem.
I tried to run this command line: sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 508B1AE5
Specifically the echo "deb http://plf.parrot.com/sphinx/binary `lsb_release -cs`/" line should output something like deb http://plf.parrot.com/sphinx/binary focal/. If it is not the case, you can run the lsb_release -cs command stand-alone, and replace its output in the first command:
$ lsb_release -cs # Might return something like 'focal', check on your system
$ echo "deb http://plf.parrot.com/sphinx/binary focal/" | sudo tee /etc/apt/sources.list.d/sphinx.list > /dev/null