I am using Ubuntu 16.04 and I am with this problem in apt-get update

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

This is not an error. It's a warning.

It says that Google uses weak security and encryption - and there's nothing you can do about it.

Your packages will still be updated.


How did you install Chrome?

Try to delete all the sources of Google Chrome from /etc/apt/sources.list and from the directory /etc/apt/sources.list.d/

Then try to download and install the package from here: https://www.google.com/chrome/browser/desktop/

In Ubuntu just double click and install with the software center.

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