I had the same problem and I found the answer here :
Add
Option "XkbVariant" "intl"
to / etc / X11 / xorg.conf.d / 10-evdev.conf
Section "InputClass"
Identifier "evdev keyboard catchall"
MatchIsKeyboard "on"
MatchDevicePath "/dev/input/event*"
Driver "evdev"
Option "XkbModel" "asus_laptop"
Option "XkbVariant" "intl"
Option "XkbLayout" "us"
EndSection
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