Comment 19 for bug 1558331

Same here:
W: gpgv:/var/lib/apt/lists/download.virtualbox.org_virtualbox_debian_dists_wily_InRelease: The repository is insufficiently signed by key 7B0FAB3A13B907435925D9C954422A4B98AB5139 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_cdemu_ppa_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key AFDF4CC6A4F32AA9395FAE8F423A2125D782A00F (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_ehoover_compholio_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 99ED08A0FCA332C7BD045B6A497A0F381F691896 (weak digest)
W: gpgv:/var/lib/apt/lists/dl.google.com_linux_chrome_deb_dists_stable_Release.gpg: The repository is insufficiently signed by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_mamarley_quassel-git_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key A0D47AB4E99FF9F9C0EA949A26F4EF8440618B66 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_mozillateam_thunderbird-next_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 0AB215679C571D1C8325275B9BDB3D89CE49EC21 (weak digest)
W: gpgv:/var/lib/apt/lists/ppa.launchpad.net_xorg-edgers_ppa_ubuntu_dists_xenial_InRelease: The repository is insufficiently signed by key 165D673674A995B3E64BF0CF4F191A5A8844C542 (weak digest)