Actually, I guess this may not be a duplicate because there may be other third-party repositories that need to do similar things (signing with --digest-algo SHA512 or the equivalent). But see bug 1556666 for the PPA case.
-- 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/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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1558331/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp