Public bug reported:

I'm using reprepro to maintain a local repository.  It doesn't compute SHA512 
hashes.
This worked fine until today, when I got this error:

buildbot@workstation:~/src/python-modules-deps/old$ apt download 
python-swagger-spec-validator
Get:1 http://buildbot.example.com/dev-bionic/apt bionic/main amd64 
python-swagger-spec-validator all 2.1.0-1 [14.8 kB]
Err:1 http://buildbot.example.com/dev-bionic/apt bionic/main amd64 
python-swagger-spec-validator all 2.1.0-1 
  Hash Sum mismatch
  Hashes of expected file:
   - SHA256:e5a36ff20cca22441dc0fe1a10566db98af9aee9e09c503179e29ccb33aac4ad
   - SHA1:3cd17f1b617277ad213f09e0f274d2ec740d44f0 [weak]
   - MD5Sum:3f310d6189ba23fb277145088d8e976e [weak]
   - Filesize:14812 [weak]
   - 
SHA512:7ad6456fe96bffe28bdb976c04a82b5ebb9b5b7c14f749c9b339147c124128692cbf4aa3d1d41cffb3079406c6e057bf90fdf2bade3f9ec22d1695f63b270f68
  Hashes of received file:
   - 
SHA512:edb96fd9989eb39d7d0984928a49fa8f8dbc23667585d30532751c730c8877298a7e55e99ed9f3ccb6923fe23eddffa5a8b205e3067624b7ef7317390026d08e
   - SHA256:e5a36ff20cca22441dc0fe1a10566db98af9aee9e09c503179e29ccb33aac4ad
   - SHA1:3cd17f1b617277ad213f09e0f274d2ec740d44f0 [weak]
   - MD5Sum:3f310d6189ba23fb277145088d8e976e [weak]
   - Filesize:14812 [weak]
  Last modification reported: Tue, 18 Sep 2018 19:28:25 +0000
Fetched 14.8 kB in 0s (1,002 kB/s)                       
W: Sources disagree on hashes for supposely identical version '2.1.0-1' of 
'python-swagger-spec-validator:amd64'.
E: Failed to fetch 
http://buildbot.example.com/dev-bionic/apt/pool/main/s/swagger-spec-validator/python-swagger-spec-validator_2.1.0-1_all.deb
  Hash Sum mismatch

The downloaded file was correct.  The 'expected' SHA512 sum appears to
have been randomly generated.

Vaguely resembles upstream bug https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=827758

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: apt 1.6.6
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Nov 20 17:06:06 2018
SourcePackage: apt
UpgradeStatus: Upgraded to bionic on 2018-04-30 (204 days ago)

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1804343

Title:
  apt: Misleadingly reports Hash Sum mismatch if package is missing
  stronger hashes

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