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I am trying to switch into Unicode entry mode using Ctrl + Shift + U, but after I hit this combination nothing happens. I also tried Ctrl + U, Ctrl + Alt + U. Do I need to enable this mode anywhere? Or maybe it works only in certain places? I use default USA layout.

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What application are you trying it in? – Chipaca Dec 20 '10 at 13:13
@Chipaca I tried in several: Firefox. Terminal, gedit... none of them works – Nutel Dec 21 '10 at 3:08
up vote 3 down vote accepted

This feature works in all gtk+-based applications when they use the default gtk+ input method. For example, all GNOME applications, and Firefox.

However, if you have enabled IBus in order to write complex scripts, then you lose the Ctrl+Shift+U facility. You would need to disable IBus and return bug to the gtk+ input method.

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It's a GNOME feature, and it should work for all GNOME applications.

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I see, seems that something is broken my OS... – Nutel Dec 20 '10 at 2:49

You get very little feedback when you do this, but, when you hit Ctrl+Shift+U you should get an underlined u. You then enter the unicode codepoint, followed by space or enter; until you hit space or enter you'll only see the underlined u followed by the codepoint as you entered it; when you hit space or enter the whole thing is replaced by the unicode character.

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