Help: modfy keyboard layout in ubuntu

Some of you may have seen that the left-shift button of my laptop keyboard has been broken. So I wanted to change the chaps lock button to left-shift. I googled a lot but there is no output.
Can you help me?

I went through the manuals and found the way.
but I messed up my own keyboard and I can't reverse it
You mean you want to use the caps lock as the left shift button right?
I know a way. its xmodmap. but as I can not reverse the affect for now, maybe you should study it yourself first before trying it

Edit:
Found it.
To reset it, use

Code:

setxkbmap

Forget the first command.
Mohaimin, we need to find the keycode of the caps lock and left shift on your laptop.

http://www.ryancooper.com/resources/keycode.asp

Go there.
Let it load totally.
After it loads,
press the left shift key.
it will show a keycode.
press caps lock.
It will show another keycode.

give them here.

I am sorry, did you post everything I need?

Umm, no actually. that's why I said we should do this together.

Hmm.. the thing we need is xmodmap.
it can assign the keycode of one key to another key.

To do that, we need to information, keysym and keycode.

open terminal, type xev, and press enter. it will show lots of things and a small window.

When it stops, press caps lock key once and release it. it will generate some lines.
Do the same for Left Shift.

Then close that small window. Find the lines generated by caps and shift key. post them here.
They will look like this:

Code:


KeyRelease event, serial 36, synthetic NO, window 0x9400001,
    root 0xae, subw 0x0, time 12753926, (182,-37), root:(185,460),
    state 0x2, keycode 66 (keysym 0xffe5, Caps_Lock), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyPress event, serial 36, synthetic NO, window 0x9400001,
    root 0xae, subw 0x0, time 12756289, (182,-37), root:(185,460),
    state 0x2, keycode 50 (keysym 0xffe1, Shift_L), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

KeyRelease event, serial 36, synthetic NO, window 0x9400001,
    root 0xae, subw 0x0, time 12756456, (182,-37), root:(185,460),
    state 0x3, keycode 50 (keysym 0xffe1, Shift_L), same_screen YES,
    XLookupString gives 0 bytes:
    XFilterEvent returns: False