http://blog.csdn.net/gavin_dinggengjia/article/details/7364375
http://www.cnblogs.com/huzhiwei/archive/2012/03/14/2396578.html
有错误
9, rm python #remove original symbolic link
10, ln -s python3.2 python # create a new symbolic link(目录可能是/usr/local/bin)
不能运行,否则,软件管理器就打不开了