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After reading a review of the Ubuntu Developer Summit which said that one of the proposed changes in 12.10 would be to use LightDM as the lock screen:

LightDM will be implemented as the lock-screen, thus adding visual and behavioural consistency to the desktop. Source

I was wondering what is the package name of the current lock-screen, or is it a part of the unity package?

As clarification it is this screen I am referring to:

enter image description here

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up vote 2 down vote accepted

The package providing the lock screen is gnome-screensaver.

Read more about it here:

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Check What is the screen locking mechanism under KDE?. It describes how you can figure it out. Although the examples in the answer are KDE based, there are notes how you can make it work for Gnome too.

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