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Okay,so few months back I read a post somewhere, dont remember where but it was on how to disable the lock screen. Now that I disable whenever the monitor switches off the system hangs. I remember Editing using gedit to do that. How do I re enable Lockscreen? I'm not talking about just removing it from the menu, im talking about disabling it completely. How do I re enable it?

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When you make amends in the menu, it usually changes something in a file. If you deleted something in a file that doesn't sound good. Can you find out which file you changed, perhaps it's in recently used files in gedit? – Joshua Siret Aug 4 '12 at 19:42
The problem is I made a while ago. And as far as I remember I didn't delete anything. I wrote something in the file like [Disable Lock Screen] some lines Instead of [Re-enable Lock screen] But I'm really not sure – Schweinsteiger Aug 4 '12 at 19:45
Hmmm, you could start by locking the screen using Ctrl+Alt+L and check it's not a problem with suspend or sleep. Obviously save your work. – Joshua Siret Aug 4 '12 at 19:46
The next thing I would do is to have a look at your log files, if something is throwing an error that would be nice. – Joshua Siret Aug 4 '12 at 19:47
As I said, I didn't remove it from the menu. I Completely disabled it. So Ctrl + Alt + L doesn't work. But in power settings it locks screen after 10 minutes so the screen hangs. I have currently changed it to Never for now so that It doesnt hang but I want to get back the lock screen feature. – Schweinsteiger Aug 4 '12 at 19:48

/etc/default/acpi-support deals with this sort of function. Perhaps LOCK_SCREEN=true is commented out with the #

# Set the following to "platform" if you want to use ACPI to shut down
# your machine on hibernation

# Comment this out to disable screen locking on resume

# Uncomment this line to have DMA disabled before suspend and reenabled
# afterwards

If it is so, try uncommenting it and it might fix your problem, you might have to restart your computer too I should add.

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Nope It was without the #. Just as you mentioned in the comment – Schweinsteiger Aug 4 '12 at 20:03
Hmmm that's a shame – Joshua Siret Aug 4 '12 at 20:04… any help? – Joshua Siret Aug 4 '12 at 20:05
I already tried that. Since that command line is for Disabling it, I used this gsettings set org.gnome.desktop.screensaver lock-enabled true Whereas in the post they asked us to use "false" – Schweinsteiger Aug 4 '12 at 20:08
if you can cause the system to hang, by making the screen lock you might see an error in one of the files I mentioned ^^^^ up there – Joshua Siret Aug 4 '12 at 20:11
up vote 0 down vote accepted

@Joshua How stupid of me. I had just turned lock screen off from Ubuntu tweak. Sorry for wasting your time.

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