Try to upgrade unity-control-center form proposed,
but found the package version is 15.04.0+16.04.20170214-0ubuntu1
$ sudo apt-get install unity-control-center/xenial-proposed
Reading package lists... Done
Building dependency tree
Reading state information... Done
Selected version '15.04.0+16.04.20170214-0ubuntu1' (Ubuntu:16.04/xenial-proposed [amd64]) for 'unity-control-center'
Try to upgrade unity-control- center form proposed, 16.04.20170214- 0ubuntu1
but found the package version is 15.04.0+
$ sudo apt-get install unity-control- center/ xenial- proposed 0+16.04. 20170214- 0ubuntu1' (Ubuntu: 16.04/xenial- proposed [amd64]) for 'unity- control- center'
Reading package lists... Done
Building dependency tree
Reading state information... Done
Selected version '15.04.