Windows需要经常清理系统才能保持捷步如飞，Ubuntu也一样需要清理系统。
平素用sudo apt-get autoclean和 sudo apt-get autoremove来清理，今天在新立得软件包管理器发现一个gtkorphan，看介绍是这么说的：
A graphical tool to find and remove orphaned libraries
GtkOrphan is a graphical tool which scans your debian system, looking for
orphaned libraries. It implements a GUI front-end to deborphan, but adds the
package removal capability.
A detailed documentation on the program can be found at:
装上去，在终端输入sudo gtkorphan来以root身份运行这个软件包。
