This is a common error that new users get on a system where no changes were made to the repository configuration.
First, you need to get the details. You can do so by opening the task or by running "apt update" manually from the command line.
Once you confirm that the system is complaining about "enterprise" repository, you can review this Wiki: https://pve.proxmox.com/wiki/Package_Repositories and utilize the GUI (Datacenter>Node>Update>Repositories) to enable no-subscription one.
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