Mon PC d'occasion a un clavier très bizarre, il a fallu que je remplace des touches:

xmodmap -e 'keycode 94=at numbersign' -e 'keycode 49=less greater less greater less greater' -e 'keycode 133=backslash'

pour connaître les touches: xev

 setxkbmap 'ch(fr),ru'

p. ex. pour avoir “Alt-Shift”

  setxkbmap -option 'grp:lalt_lshift_toggle'
  
* [[https://askubuntu.com/questions/254424/how-can-i-change-what-keys-on-my-keyboard-do-how-can-i-create-custom-keyboard|How can I change what keys on my keyboard do? (How can I create custom keyboard commands/shortcuts?) - Ask Ubuntu]]
* [[https://help.ubuntu.com/community/Custom%20keyboard%20layout%20definitions?action=show&redirect=Howto%3A+Custom+keyboard+layout+definitions|Custom keyboard layout definitions - Community Help Wiki]]