Ubuntu 16.04 Software Update GUI is hanging and I'm getting this message in the terminal

[Tom H]

On Fri, May 20, 2016 at 6:09 PM, Keith <keith_linux at comcast.net> wrote:
>>
>> 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)
>
> Does anyone know how to get around this?

It's a warning that Google hasn't stopped using SHA1. There's nothing
that you can do, except hope that it'll upgrade its signing key before
the warning turns into an error.