Comment 41 for bug 1558331

The same problem:
 http://download.virtualbox.org/virtualbox/debian/dists/wily/InRelease: Signature by key W: http://download.virtualbox.org/virtualbox/debian/dists/wily/InRelease: Signature by key 7B0FAB3A13B907435925D9C954422A4B98AB5139 uses weak digest algorithm (SHA1)
W: http://ppa.launchpad.net/atareao/atareao/ubuntu/dists/xenial/InRelease: Signature by key A3D8A366869FE2DC5FFD79C36A9653F936FD5529 uses weak digest algorithm (SHA1)
W: http://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)
W: http://ppa.launchpad.net/indicator-multiload/stable-daily/ubuntu/dists/xenial/InRelease: Signature by key 29A2D308818C59EB8AC53826D834D91FA49CCDDB uses weak digest algorithm (SHA1)
W: http://ppa.launchpad.net/libreoffice/ppa/ubuntu/dists/xenial/InRelease: Signature by key 36E81C9267FD1383FCC4490983FBA1751378B444 uses weak digest algorithm (SHA1)
W: http://download.opensuse.org/repositories/isv:/ownCloud:/desktop/Ubuntu_15.10/Release.gpg: Signature by key F9EA4996747310AE79474F44977C43A8BA684223 uses weak digest algorithm (SHA1)
W: http://ppa.launchpad.net/videolan/stable-daily/ubuntu/dists/xenial/InRelease: Signature by key 3361E59FF5029E6B90A9A80D09589874801DF724 uses weak digest algorithm (SHA1)