Same bug here:
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_gnumdk_lollypop_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 8FAD14A04A8E87F23FB5653BDBA501177AA84500 (weak digest)
W: gpgv:/var/lib/apt/lists/repository.spotify.com_dists_stable_InRelease: The repository is insufficiently signed by key BBEBDCB318AD50EC6865090613B00F1FD2C19886 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_linrunner_tlp_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 2042F03C5FABD0BA2CED40412B3F92F902D65EFF (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_mc3man_mpv-tests_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 8E51A6D660CD88D67D65221D90BD7EACED8E640A (weak digest)
Same bug here: lib/apt/ lists/ppa. launchpad. net_gnumdk_ lollypop_ ubuntu_ dists_xenial_ InRelease: The repository is insufficiently signed by key 8FAD14A04A8E87F 23FB5653BDBA501 177AA84500 (weak digest) lib/apt/ lists/repositor y.spotify. com_dists_ stable_ InRelease: The repository is insufficiently signed by key BBEBDCB318AD50E C6865090613B00F 1FD2C19886 (weak digest) lib/apt/ lists/ppa. launchpad. net_linrunner_ tlp_ubuntu_ dists_xenial_ InRelease: The repository is insufficiently signed by key 2042F03C5FABD0B A2CED40412B3F92 F902D65EFF (weak digest) lib/apt/ lists/ppa. launchpad. net_mc3man_ mpv-tests_ ubuntu_ dists_xenial_ InRelease: The repository is insufficiently signed by key 8E51A6D660CD88D 67D65221D90BD7E ACED8E640A (weak digest)
W: gpgv:/var/
W: gpgv:/var/
W: gpgv:/var/
W: gpgv:/var/