[TriLUG] xkb / xmodmap

[David Brain via TriLUG]

Hi,

Have a laptop where up/down keys don't work - had originally used xmodmap
to remap Right-ALT Left/Right to Up Down.  No, with Ubuntu 21.04 xmodmap
has been deprecated and xkb seems to be the way to go - does anyone have
any pointers as to how to achieve the remapping with xkb, so far my
attempts have not been successful.

With xmodmap I was using as my .Xmodmap:

keycode 108 = Mode_switch
keysym Left = Left Left Up
keysym Right = Right Right Down

Thanks,

David.