转自：http://blog.sina.com.cn/s/blog_a04f0d1c0101bwk1.html
1.安装ibus-el：sudo apt-get install ibus-el
2.将如下内容添加至～/.emacs
(require 'ibus)
;; Turn on ibus-mode automatically after loading .emacs
(add-hook 'after-init-hook 'ibus-mode-on)
;; Use C-SPC to toggle input status
(global-set-key (kbd "C-SPC") 'ibus-toggle)
;; Use s-SPC to set mark
(global-set-key (kbd "s-SPC") 'set-mark-command)