11.28

https://askubuntu.com/questions/555075/could-not-open-x-display-giggle-cannot-open-display

https://superuser.com/questions/310197/how-do-i-fix-a-cannot-open-display-error-when-opening-an-x-program-after-sshi

http://blog.csdn.net/creazyapple/article/details/8668334