Comment 10 for bug 1719938

cat /etc/default/keyboard
# KEYBOARD CONFIGURATION FILE

# Consult the keyboard(5) manual page.

XKBMODEL="pc105"
XKBLAYOUT="cn"
XKBVARIANT=""
XKBOPTIONS=""

BACKSPACE="guess"

gsettings get org.gnome.desktop.input-sources sources
[('xkb', 'cn'), ('xkb', 'us'), ('fcitx', 'pinyin')]