Comment 2 for bug 1413165

Here is the output of the command on a vivid installation, that has not been updated since the middle of December 2014 and where the regression was not present yet:

$ sudo apt-cache policy unity
unity:
  Installed: 7.3.1+15.04.20141128-0ubuntu1
  Candidate: 7.3.1+15.04.20150115-0ubuntu1
  Version table:
     7.3.1+15.04.20150115-0ubuntu1 0
        500 http://ubuntu.mirror.root.lu/ubuntu/ vivid/main amd64 Packages
 *** 7.3.1+15.04.20141128-0ubuntu1 0
        100 /var/lib/dpkg/status

And here the output of the command on my uptodate vivid installation having the regression:

$ sudo apt-cache policy unity
unity:
  Installed: 7.3.1+15.04.20150115-0ubuntu1
  Candidate: 7.3.1+15.04.20150115-0ubuntu1
  Version table:
 *** 7.3.1+15.04.20150115-0ubuntu1 0
        500 http://ubuntu.mirror.root.lu/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status

As far as I understand, the regression happened somewhere between the two versions.