Failed to fetch
Distributor ID: Ubuntu
Description: Ubuntu 22.04.3 LTS
Trying to Install Carbonio CE, but get
E: Failed to fetch https://repo.zextras.io/release/ubuntu/dists/jammy/InRelease 403 Forbidden [IP: 22.214.171.124 443]
E: The repository 'https://repo.zextras.io/release/ubuntu jammy InRelease' is not signed.
There are many similar posts some of them solved but no clear explaination
Sorry to hear about your trouble.
Right now only Ubuntu 20.04 LTS (Focal Fossa) & RHEL8 are the officially supported OS for Carbonio CE. Though, you can try installing Carbonio CE in some other similar OSs but it is not recommended at all and definitely not for any production environment.
You can read more about this in our official documentation:
I am again sorry for your trouble. But I hope you would understand.
OK I now realise I should not have upgraded Ubuntu, thanks