It was working on Gnome Fallback/Classic. But after
compiz-manager package installation, I lost Ctrl + shortcut keys, they don't work anymore.
For example, in web browser typing Ctrl+C on some text makes it gray, and don't get it copied. Deleting
compiz-manager and reinstalling gnome didn't solve the problem.
However, on Gnome Shell 3 all works fine.
Please, help me to solve this.