pikachu@pikachu-PC:~/Desktop$ yong

(yong:18920): Gtk-WARNING **: 21:32:55.929: 无法在模块路径中找到主题引擎：“adwaita”，

(yong:18920): Gtk-WARNING **: 21:32:55.929: 无法在模块路径中找到主题引擎：“adwaita”，
yong start fail, may XIM daemon named "fcitx" there

solution: https://www.cnblogs.com/liang3044/p/9545630.html
but

pikachu@pikachu-PC:~/Desktop$ yong
yong start fail, may XIM daemon named "fcitx" there