$ sudo apt-get --purge remove happy
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'happy' is not installed, so not removed
The following packages were automatically installed and are no longer required:
  linux-headers-3.13.0-32 linux-headers-3.13.0-32-generic
  linux-image-3.13.0-32-generic linux-image-extra-3.13.0-32-generic
  thunderbird-locale-en thunderbird-locale-en-gb thunderbird-locale-en-us
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.