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Created January 16, 2025 18:45
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At least one invalid signature was encountered docker error
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fix-at-least-one-invalid-signature-was-encountered.md

Fix "At least one invalid signature was encountered"

When trying to build a Debian container, I encountered a bunch of errors like this upon running apt update:

W: GPG error: http://deb.debian.org/debian buster InRelease: At least one invalid signature was encountered.
E: The repository 'http://deb.debian.org/debian buster InRelease' is not signed.

The issue seems to be a lack of disk space. This StackOverflow answer was indeed correct: running docker image prune -f and docker container prune -f fixed the problem.

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