loadkeys says "Couldn't get a file descriptor referring to the console" in chroot on ChromeOS

I've been trying the "Developer console" in ChromeOS( dev mode), which is entered by Ctrl+Alt+Forward but when switching the keyboard layout with loadkeys cz I got an error saying Couldn't get a file descriptor referring to the console. + I get the same when chroot is entered from crosh, but in that case the layout set in ChromeOS is used, which is fine. I can see that the keyboard code is correct with ls /usr/share/X11/xkb/symbols/ In addition I've found the response of loadkeysis the same in Crosh , only there is the language/layout inherited from the system setup. Is there any other way to set the keyboard mapping/layout in shell?