It looks like you have a PPA enabled on your system from a previous release, and the PPA does not have files relevant to xenial. I suggest having a look in /etc/apt/sources.list.d and removing any references to the ubuntu-audio-dev PPA for xenial.
Luke _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-audio-dev Post to : ubuntu-audio-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-audio-dev More help : https://help.launchpad.net/ListHelp
