*** This bug is a security vulnerability ***

You have been subscribed to a public security bug by Seth Arnold (seth-arnold):

# apt-get update
(proceeded normally until...)
Err:24 http://us.archive.ubuntu.com/ubuntu bionic-backports i386 Contents (deb)
  Hash Sum mismatch
  Hashes of expected file:
   - Filesize:724924 [weak]
   - SHA256:d59f30b35a9fd0f52922cbf3a4bf1f0713e816a209cca57bac1dbc56af3c9a77
   - SHA1:0d1e53232da2c41febc6cccecfc4000f930c3450 [weak]
   - MD5Sum:dfa1f7010a23b70c967aef7600ebd49f [weak]
  Hashes of received file:
   - SHA256:1c97d900fc3b9168c38bf870b1dd7c71be88ff72e0751c1551b8129c8de98740
   - SHA1:a725025e50c3ebd60dd16058594340b4ca9c97e2 [weak]
   - MD5Sum:925bb2a78f81a2dc9b4269a6f5e9ece5 [weak]
   - Filesize:90948 [weak]
  Release file created at: Fri, 22 May 2020 16:49:51 +0000
Fetched 254 MB in 51s (5,014 kB/s)
Reading package lists... Done
E: Failed to fetch 
store:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_bionic-backports_Contents-i386.gz
  Hash Sum mismatch
   Hashes of expected file:
    - Filesize:724924 [weak]
    - SHA256:d59f30b35a9fd0f52922cbf3a4bf1f0713e816a209cca57bac1dbc56af3c9a77
    - SHA1:0d1e53232da2c41febc6cccecfc4000f930c3450 [weak]
    - MD5Sum:dfa1f7010a23b70c967aef7600ebd49f [weak]
   Hashes of received file:
    - SHA256:1c97d900fc3b9168c38bf870b1dd7c71be88ff72e0751c1551b8129c8de98740
    - SHA1:a725025e50c3ebd60dd16058594340b4ca9c97e2 [weak]
    - MD5Sum:925bb2a78f81a2dc9b4269a6f5e9ece5 [weak]
    - Filesize:90948 [weak]
   Release file created at: Fri, 22 May 2020 16:49:51 +0000
E: Some index files failed to download. They have been ignored, or old ones 
used instead.

$ apt-get -v
apt 1.6.12ubuntu0.1 (amd64)

Also, Software Updater (version 1:18.04.11.12) after hitting "Install" gives 
pop-up:
"Requires installation of untrusted packages
 This requires installing packages from unauthenticated sources."
Only options: "Settings..." and "OK"
And it is not OK; I have not configured any unauthenticated sources!

This occurs when enabling updates from Ubuntu Base (but not Security
updates).

I expected to not get such errors and updating to occur normally.

$ lsb_release -rd
Description:    Ubuntu 18.04.4 LTS
Release:        18.04

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

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

-- 
ubuntu bionic-backports Hash Sum mismatch
https://bugs.launchpad.net/bugs/1880222
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which is subscribed to the bug report.

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