Am 18.09.2016 um 20:55 schrieb Juan Hinojos:
In your guide (v. 2.1.x), under section '2.2. Basic Editing Features',
the keyboard shortcut for Cut, Copy, and Paste are all Ctrl+X, instead
of the corresponding Ctrl+X, Ctrl+C, and Ctrl+V.
Then you installation is incorrect. The shortcuts are created using
information form your operation system. This usually works fine with
Windows, Linux and Mac OS.
What is your OS?
In every case please reconfigure LyX (menu Tools->Reconfigures) and if
the problem persists, please report it as bug here:
http://www.lyx.org/trac/wiki/BugTrackerHome
thanks and regards
Uwe