I did the following:
Edited:
$ sudo mcedit /etc/default/keyboard
XKBMODEL="pc105"
XKBLAYOUT="hu"
XKBVARIANT="nodeadkeys"
XKBOPTIONS="ctrl:swapcaps"
BACKSPACE="guess"
according to man keyboard
XKBOPTIONS may have values described here:
$ mlocate xorg.lst
/usr/share/X11/xkb/rules/xorg.lst
/usr/share/doc/keyboard-configuration/xorg.lst
These two files are identical.
$ less /usr/share/doc/keyboard-configuration/xorg.lst
The edited /etc/defalut/keyboard file came a live for the console after
the following command:
$ sudo setupcon
For X Window maybe one must relogin.