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

[Chris Green]

On Fri, May 20, 2016 at 09:09:22AM -0700, Keith 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?
> 
I don't think the above will make things hang, I see them all the time
and things work OK.

-- 
Chris Green