rob@rob-Lenovo:~$ apt-get source tar
Reading package lists... Done
Building dependency tree
Reading state information... Done
NOTICE: 'tar' packaging is maintained in the 'Git' version control system at:
git://git.gag.com/debian/tar
WARNING: The following packages cannot be authenticated!
  tar
E: Some packages could not be authenticated
rob@rob-Lenovo:~$ ls
arduino-1.0.5  Downloads  node-v0.10.33-linux-x86  Public      temp       test.txt  workspace
Desktop        Dropbox    Pictures                 sketchbook  Templates  Videos
rob@rob-Lenovo:~$ ^C
rob@rob-Lenovo:~$