in my terminal apt-get update answered:
W: http://archive.getdeb.net/ubuntu/dists/xenial-getdeb/InRelease: Signature by key 1958A549614CE21CFC27F4BAA8A515F046D7E7CF 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://dl.google.com/linux/chrome/deb/dists/stable/Release.gpg: Signature by key 3B068FB4789ABE4AEFA3BB491397BC53640DB551 uses weak digest algorithm (SHA1)
in my terminal apt-get update answered:
W: http:// archive. getdeb. net/ubuntu/ dists/xenial- getdeb/ InRelease: Signature by key 1958A549614CE21 CFC27F4BAA8A515 F046D7E7CF uses weak digest algorithm (SHA1)
W: http:// dl.google. com/linux/ chrome/ deb/dists/ stable/ Release. gpg: Signature by key 4CCA1EAF950CEE4 AB83976DCA04083 0F7FAC5991 uses weak digest algorithm (SHA1)
W: http:// dl.google. com/linux/ chrome/ deb/dists/ stable/ Release. gpg: Signature by key 3B068FB4789ABE4 AEFA3BB491397BC 53640DB551 uses weak digest algorithm (SHA1)