When I run sudo apt-get update in 16.04, I am getting a curious 3 lines at the end:
W: http://debian.yeasoft.net/btsync/dists/unstable/InRelease: Signature by key 06ABBEA18548527F04A2FC2840FC0CD26BF18B15 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://download.videolan.org/pub/debian/stable/Release.gpg: Signature by key 8F0845FE77B16294429A79346BCA5E4DB84288D9 uses weak digest algorithm (SHA1)
I am guessing that these lines are related to VLC, which was already installed, and google chrome and BTsync which I installed myself. Anybody any ideas if this is a problem and how to fix it