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I've recently switched from Windows to Ubuntu 11.04, and a difference that bugs me a bit is, when a dead key (such as ^ or ´) is pressed twice, the behavior differs in the two OS'es.

On Windows, the first press is dead, but the second press gives you two characters. So, for instance, pressing ¨ once nets you nothing, but twice nets you ¨¨.

On Ubuntu, the first press is also dead, but the second press only nets you one character. So, pressing ¨ once nets you nothing, twice nets you ¨.

What I'd like to do is make dead keys function as on Windows, that is, pressing them twice nets you the character two times.

I do not wish to make them non-dead, as I then wouldn't be able to write for ü, for instance.

Is such a thing possible, and if so, how?

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Just out of curiosity, I remember this behavior from my Windows days and it always boggled me what the use case could be for wanting two of them, any insight? I don't think there was a single time where I didn't use the backspace after hitting a dead key twice. – Ward Muylaert Jun 20 '11 at 10:04
For instance, when writing LaTeX, quoted text is written like ``this''. There's also the smiley ^^. – Sebastian Paaske Tørholm Jun 20 '11 at 11:07
I see, Kile autocorrects my " into `` or '' depending on what's needed. – Ward Muylaert Jun 20 '11 at 11:51
I just defined my own qq{} and q{} function for quotes. If you use a specific editor, you might be able to program that one ` will output `` or so – Martin Ueding Aug 13 '11 at 22:23

You can get similar behavior with the compose key. The compose key can be set under System Settings -> Keyboard -> Layout -> Options -> Compose Key. Now, to type ü, press compose, release compose and then proceed as you would in Windows.

Edit: Misread slightly, you'd need to make the keys dead before doing this, which for me, they were by default.

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What you're asking isn't possible as far as I know; however if you would change your keyboard-layout to one with AltGr deadkeys, you'll still be able to have your deadkeys like ü.

How to get those deadkeys is very easy; e.g. ü would be AltGr + Shift + '.

If you don't have a dedicated AltGr key, then the right Alt key would be that key.

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