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pknbe@volny.cz ۲۰۱۴
Enable the compose key by default for all users.

# Enable the compose key

To enable the Compose key and configure a certain key on your keyboard as the Compose key, set the org.gnome.desktop.input-sources.xkb-options GSettings key. That way, the setting will be enabled by default for all users on your system.

# Set the Right Alt key as the Compose key

Create a local database for machine-wide settings in /etc/dconf/db/local.d/00-input-sources:

[org/gnome/desktop/input-sources] # Set the Right Alt key as the Compose key and enable it xkb-options=['compose:ralt']

If you want to set a different key than Right Alt, replace ralt with the name of that key as specified in the xkeyboard-config(7) man page, section Position of Compose key.

Override the user's setting and prevent the user from changing it in /etc/dconf/db/local.d/locks/input-sources:

# Lock the list of enabled XKB options /org/gnome/desktop/input-sources/xkb-options