Comment 25 for bug 1558331

All PPAs I have, on the site launchpad says are compatible with Ubuntu 16.04

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W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_libreoffice_libreoffice-5-1_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 36E81C9267FD1383FCC4490983FBA1751378B444 (weak digest)

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W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_otto-kesselgulasch_gimp_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key FB97E9C3A97F85C095AEA7903BDAAC08614C4B38 (weak digest)

W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_sunab_kdenlive-release_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 6976C1CEB06586061C2C0472B5115B98AA836CA8 (weak digest)

W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_webupd8team_atom_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 7B2C3B0889BF5709A105D03AC2518248EEA14886 (weak digest)

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Only Megasync I downloaded the deb

W: gpgv:/var/lib/apt/lists/mega.nz_linux_MEGAsync_xUbuntu%5f15.04_._Release.gpg: The repository is insufficiently signed by key BF8B66E01192CBA2E72201294B4E7A9523ACD201 (weak digest)