Hi Since at least saturday the wolfram repository for the raspberry pi is down. This is very annoying when you try to update the operating system...
Good someone please work on that?
I understand the server was affected by a hardware failure, however it has been back online for some time. In case you still can't reach it, you can try
sudo mv /etc/apt/sources.list.d/wolfram.list /etc/apt/sources.list.d/wolfram.disabled
This repository shouldn't be necessary anyway since the wolfram-engine package is hosted at
and the reference to the old repository should be removed automatically once you upgrade to the latest wolfram-engine.