The reason is quite simple:
This PPA has been removed from public access as part of a protest against the abuse of open-source projects by large companies. For more detail visit the main page here: https:/
If you are a company and you would like this PPA to continue then let me know your preferred route for contributions and I will arrange something.
If we have already been in contact then ping me your Launchpad ID and I will add you to a private PPA in the meantime.
So what ist the answer of Palo AltoNetworks?