Error updating on Ubuntu

Hey everyone,

When I run a simple sudo apt-get update I get the following error message:
Fehlschlag beim Holen von https://apt.retorque.re/file/zotero-apt/./InRelease »apt.retorque.re« konnte nicht aufgelöst werden.

In English in something like this:
Failed to fetch https://apt.retorque.re/file/zotero-apt/./InRelease "apt.retorque.re" could not be resolved.

Can someone tell me how to get rid of this?

Thanks in advance.
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