Julian - I just tried and it seems like Post-Invoke is run when there is
a W: but not an E: - is that right?

In this snippet I've added an Apt::Update::Post-Invoke { "echo 'hello' }

Reading package lists... Done                      
W: http://dl.google.com/linux/musicmanager/deb/dists/stable/Release.gpg: 
Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest 
algorithm (SHA1)
W: http://dl.google.com/linux/talkplugin/deb/dists/stable/Release.gpg: 
Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest 
algorithm (SHA1)
W: http://ppa.launchpad.net/pitti/systemd/ubuntu/dists/trusty/Release.gpg: 
Signature by key FB322597BBC86D52FEE950E299B656EA8683D8A2 uses weak digest 
algorithm (SHA1)
E: Failed to fetch 
http://dl.google.com/linux/musicmanager/deb/dists/stable/Release  No Hash entry 
in Release file 
/var/lib/apt/lists/dl.google.com_linux_musicmanager_deb_dists_stable_Release 
which is considered strong enough for security purposes
E: Failed to fetch 
http://dl.google.com/linux/talkplugin/deb/dists/stable/Release  No Hash entry 
in Release file 
/var/lib/apt/lists/dl.google.com_linux_talkplugin_deb_dists_stable_Release 
which is considered strong enough for security purposes
E: Some index files failed to download. They have been ignored, or old ones 
used instead.
laney@raleigh>

...and then after removing the google repositories:

Hit:10 http://ppa.launchpad.net/pitti/systemd/ubuntu trusty Release
hello
Reading package lists... Done
Building dependency tree       
Reading state information... Done
9 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: http://ppa.launchpad.net/pitti/systemd/ubuntu/dists/trusty/Release.gpg: 
Signature by key FB322597BBC86D52FEE950E299B656EA8683D8A2 uses weak digest 
algorithm (SHA1)
laney@raleigh> 
I see <https://anonscm.debian.org/cgit/apt/apt.git/tree/apt-pkg/update.cc#n108> 
which looks like it's where the function is returning from (didn't trace it 
though), which would prevent the Post-Inboke hook from running.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to apt in Ubuntu.
https://bugs.launchpad.net/bugs/1562733

Title:
  apt signature requierements prevent updates from some repositories

Status in appstream package in Ubuntu:
  Confirmed
Status in apt package in Ubuntu:
  In Progress

Bug description:
  Since xenial updated the requirements for the strength of PGP
  signatures of packages, packages from some repositories are no longer
  updated. Apt-get update reports these errors:

  E: Failed to fetch http://[...]/Release  No Hash entry in Release file 
/var/lib/apt/lists/partial/[...] which is considered strong enough for security 
purposes
  E: Some index files failed to download. They have been ignored, or old ones 
used instead.

  While the motivation for the change is valid, the result is a
  potential security problem, as the new versions of the packages that
  may fix recently discovered vulnerabilities are not automatically
  installed.

  One less important but unfortunate effect is a scary message that is
  displayed to the user, without clear explanation that the problem
  needs to be addressed by the repository owner.

  Related: Bug #1558331

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/appstream/+bug/1562733/+subscriptions

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