Comment 7 for bug 1523929

@Tim, well, when I run the command "apt-cache policy libgtk-3-dev" I get this output:

    libgtk-3-dev:
    Installed: 3.18.5-1ubuntu2~wily1
    Candidate: 3.18.5-1ubuntu2~wily1
      Version table:
     *** 3.18.5-1ubuntu2~wily1 0
            500 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu/ wily/main amd64 Packages
            100 /var/lib/dpkg/status
         3.16.7-0ubuntu3 0
            500 http://archive.ubuntu.com/ubuntu/ wily/main amd64 Packages