Dr. Peter Pöml wrote:
Any serious operating system update client / download tool should do something 
like this
apt is pretty good at refusing files that don't match what it expected. The "release" file is signed with a gpg key and then there is a chain of hashes leading from the release file to the "packages" file and then down to the actual binary packages and files that make up source packages.

What it won't do is automatically retry stuff that was not found or found to be corrupted, that is
down to the user to reissue the command.

Even if the mirror was atomically updated its still possible for users to get 404 errors since their
package lists may be out of date.

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