[Bug 1558331] Re: After upgrading to apt 1.2.7 in Xenial, PPAs and most other third-party repositories become unusable with "The repository is insufficiently signed by key (weak digest)"

[Lonnie Lee Best]

I'm having the same issue with the google talk plugin, remmina, shutter,
and variety:

W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_peterlevi_ppa_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 876E675CB1AABA3494F27BA6C45A53C1A546BE4F (weak digest)
W: gpgv:/var/lib/apt/lists/partial/dl.google.com_linux_talkplugin_deb_dists_stable_Release.gpg: The repository is insufficiently signed by key 4CCA1EAF950CEE4AB82976DCA040830F7FAC5991 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_remmina-ppa-team_remmina-next_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 04E38CE134B269B9F38F82EE8A993C2521C5F0BA (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_shutter_ppa_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 5017D4931D0ACADE295B68ADFC6D8D9D009ED615 (weak digest)
W: Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/stable/Release  No Hash entry in Release file /var/lib/apt/lists/partial/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.

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https://bugs.launchpad.net/bugs/1558331

Title:
  After upgrading to apt 1.2.7 in Xenial, PPAs and most other third-
  party repositories become unusable with "The repository is
  insufficiently signed by key  (weak digest)"

Status in apt package in Ubuntu:
  Confirmed

Bug description:
  The title pretty much says it all.

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