Ironically, I tried to install some debug symbols today and also got these messages:
W: gpgv:/var/lib/apt/lists/partial/ddebs.ubuntu.com_dists_xenial_Release.gpg: The repository is insufficiently signed by key 2512191FEF8729D6E5AF414DECDCAD72428D7C01 (weak digest)
Ironically, I tried to install some debug symbols today and also got these messages:
W: gpgv:/var/ lib/apt/ lists/partial/ ddebs.ubuntu. com_dists_ xenial_ Release. gpg: The repository is insufficiently signed by key 2512191FEF8729D 6E5AF414DECDCAD 72428D7C01 (weak digest)