How to create unified clipboard

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http://askubuntu.com – Working with clipboard can be like a hell. Sometimes Ctrl+C just don't work and if you copy some text on, say, web browser you can't normally paste in somewhere else. Especially between Terminal and other programs. Sometmies you have to paste with Ctrl+Shift+Insert sometimes Ctrl+V. Is there any way to unify handling clipboard? (HowTos)