ubuntu下出现The system is running in low-graphics mode的问题

http://askubuntu.com/questions/141606/how-to-fix-the-system-is-running-in-low-graphics-mode-error

http://blog.csdn.net/sixleaves/article/details/8972385

http://blog.sina.com.cn/s/blog_66439a3e0101bnce.html

http://www.linuxidc.com/Linux/2013-02/80127.htm

http://www.linuxidc.com/Linux/2012-10/72058.htm

http://www.orsoon.com/news/33416.html

http://blog.csdn.net/efeics/article/details/38118735