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@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) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apt in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1558331/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp