In my case it's:
Code:
$ sudo dpkg -i unity-greeter_0.2.7-0ubuntu2~depurpled_amd64.deb 
(Reading database ... 370771 files and directories currently installed.)
Preparing to replace unity-greeter 0.2.7-0ubuntu1 (using unity-greeter_0.2.7-0ubuntu2~depurpled_amd64.deb) ...
Unpacking replacement unity-greeter ...
Setting up unity-greeter (0.2.7-0ubuntu2~depurpled) ...
Processing triggers for libglib2.0-0:i386 ...
Processing triggers for libglib2.0-0 ...