[Bug 1558331] Re: message "The repository is insufficiently signed by key (weak digest)" is poorly worded

[Injigo]

I'm getting this error in a live session of Ubuntu 16.04 Desktop Beta 2
amd64 when I run "sudo apt-get update". This is a fresh boot running
directly from an ISO booted from the hard drive. I've added no PPA's.

ubuntu at ubuntu:~$ sudo apt-get update
Ign:1 cdrom://Ubuntu 16.04 LTS _Xenial Xerus_ - Beta amd64 (20160323) xenial InRelease
Hit:2 cdrom://Ubuntu 16.04 LTS _Xenial Xerus_ - Beta amd64 (20160323) xenial Release
Hit:4 http://archive.ubuntu.com/ubuntu xenial InRelease                        
Hit:5 http://archive.ubuntu.com/ubuntu xenial-updates InRelease                
Hit:6 http://security.ubuntu.com/ubuntu xenial-security InRelease              
Reading package lists... Done 
W: gpgv:/var/lib/apt/lists/Ubuntu%2016.04%20LTS%20%5fXenial%20Xerus%5f%20-%20Beta%20amd64%20(20160323)_dists_xenial_Release.gpg: The repository is insufficiently signed by key C5986B4F1257FFA86632CBA746181433FBB75451 (weak digest)

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https://bugs.launchpad.net/bugs/1558331

Title:
  message "The repository is insufficiently signed by key  (weak
  digest)" is poorly worded

Status in apt package in Ubuntu:
  Fix Released

Bug description:
  The title pretty much says it all.

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