You should run that command without "sudo".
gsettings set org.gnome.desktop.input-sources show-all-sources true
** Package changed: xkeyboard-config (Ubuntu) => gnome-control-center
(Ubuntu)
** Changed in: gnome-control-center (Ubuntu)
Status: New => Invalid
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** Attachment added: "Setting with terminal"
https://bugs.launchpad.net/ubuntu/+source/xkeyboard-config/+bug/1965610/+attachment/5570660/+files/extra_layouts.png
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