Thanks Julian! I tested the apt 1.2.18 packages and found the results far more pleasing:
... Fetched 1,688 kB in 2s (685 kB/s) Reading package lists... Done W: http://mirrors.kernel.org/ubuntu/dists/xenial/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ddebs.gpg are ignored as the file is not readable by user 'root' executing apt-key. W: http://mirrors.kernel.org/ubuntu/dists/xenial-updates/InRelease: The key(s) in the keyring /etc/apt/trusted.gpg.d/ddebs.gpg are ignored as the file is not readable by user 'root' executing apt-key. ... It may be a bit verbose, one line per configured source, but for the average user it shouldn't be overwhelming, and it very clearly points to the cause of the problem and the solution. Thanks for working through this with me, I know it took a lot of time and effort. ** Tags removed: verification-needed ** Tags added: verification-done -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1642386 Title: At least one invalid signature was encountered. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1642386/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs