Err:10 https://neilmunday.github.io/slurm-mail/repo/ub20 ./ Packages
404 Not Found
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Reading package lists... Done
E: Failed to fetch https://neilmunday.github.io/slurm-mail/repo/ub20/./Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
Example: