Comment 88 for bug 1558331

 I have also same problem with Google Earth

http://dl.google.com/linux/earth/deb/dists/stable/Release.gpg: Signature by key 4CCA1EAF950CEE4AB83976DCA040830F7FAC5991 uses weak digest algorithm (SHA1)Failed to fetch

http://dl.google.com/linux/earth/deb/dists/stable/Release No Hash entry in Release file /var/lib/apt/lists/partial/dl.google.com_linux_earth_deb_dists_stable_Release which is considered strong enough for security purposes

Some index files failed to download. They have been ignored, or old ones used instead.