Comment 13 for bug 1532631

Installing one of the betas from Mixxxbetas also fails, despite being flagged as suitable for xenial:

root@luna:/etc/apt/sources.list.d# apt-cache policy mixxx
mixxx:
  Installed: 2.1.0~rc1-ppa1~2.1~git6663~xenial
  Candidate: 2.1.2~pre~git6745-0ubuntu1~2.1~git6745~xenial
  Version table:
     2.1.2~pre~git6745-0ubuntu1~2.1~git6745~xenial 500
        500 http://ppa.launchpad.net/mixxx/mixxxbetas/ubuntu xenial/main amd64 Packages
 *** 2.1.0~rc1-ppa1~2.1~git6663~xenial 100
        100 /var/lib/dpkg/status
     2.0.0~dfsg-4 500
        500 http://mirror.steadfast.net/ubuntu xenial/universe amd64 Packages
root@luna:/etc/apt/sources.list.d# apt-get install mixxx
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 mixxx : Depends: libtag1-vanilla (>= 1.10-0ubuntu1~xenial0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.