You get a Payment Required error when attempting to fetch certain packages:
E: Failed to fetch https://packagecloud.io/github/git-lfs/ubuntu/dists/focal/InRelease 402 Payment Required [IP: 188.8.131.52 443] E: The repository 'https://packagecloud.io/github/git-lfs/ubuntu focal InRelease' is not signed.
According to the documentation for this response on developer.mozilla.org, the HTTP
402 Payment Requiredis a nonstandard response status code that is reserved for future use. This status code was created to enable digital cash or (micro) payment systems and would indicate that the requested content is not available until the client makes a payment. Sometimes, this status code indicates that the request cannot be processed until the client makes a payment. However, no standard use convention exists and different entities use it in different contexts.
You can solve the problem by using the following script:
sudo rm -fv /etc/apt/sources.list.d/github_git-lfs.list sudo rm -fv /etc/apt/sources.list.d/github_git-lfs.list.save
Loss of access
While the script posted above will serve as a workaround, the user may experience loss of access to certain external libraries. The only sure fix is to ensure that, wherever in the chain of services the lapse occurred, the expired subscription or lapsed payment must be renewed.