I installed the CE version on my VM all fine.
I then received a trial for the Pro.
However im not able to complete step 5. from this guide: https://help.passbolt.com/hosting/install/pro/ubuntu/ubuntu.html
I have tried several times over, and made sure I enter it correctly.
But when i do sudo apt-get update I keep getting Malformed stanza 1 in sources as shown in this picture: