me@my-machine ~❯ apt-cache policy tmux
tmux:
  Installed: 1.6-1ubuntu1
  Candidate: 1.6-1ubuntu1
  Version table:
 *** 1.6-1ubuntu1 0
        500 http://br.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status