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I have read in many blogs that old lock screen is replaced by new lock screen in Ubuntu 12.04

But when I installed 12.04 Beta 2 (and updated my system) , its still showing old lock screen. Any idea if its delayed ?

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They took it in despite the regressions (e. g. the leave message feature disappeared). – Hendrik Brummermann Apr 28 '12 at 6:17
up vote 4 down vote accepted

It was suggested and I do remember seeing this on my system somewhere down the road in one of the alphas but later updates removed it.

As you can see from comments 22 and 23 this probably wont land on 12.04 since it introduced major regressions that could not easy be fixed on time to test, after all 12.04 is a LTS, we want things to work as good as they can get.

A far as I can tell, it was really awesome but I do remember having some issues that already described on the bug report. Think you will have to wait for 12.10 to see this implemented properly.

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Remove gnome-screen saver and install xscreensaver:

sudo apt-get remove gnome-screensaver

sudo apt-get install xscreensaver xscreensaver-gl-extra xscreensaver-data-extra

Set the option to lock the screen after 1 minute.

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