骨头源是由bones7456所架设的一个ubuntu源，今天更换了它的源，速度也不错，推荐大家使用,
　　添加方法：
　　先备份下原先的文件
　　sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
　　代码：
　　deb http://ubuntu.srt.cn/ubuntu/ karmic main restricted universe multiverse
　　deb http://ubuntu.srt.cn/ubuntu/ karmic-security main restricted universe multiverse
　　deb http://ubuntu.srt.cn/ubuntu/ karmic-updates main restricted universe multiverse
　　deb http://ubuntu.srt.cn/ubuntu/ karmic-proposed main restricted universe multiverse
　　deb http://ubuntu.srt.cn/ubuntu/ karmic-backports main restricted universe multiverse
　　deb-src http://ubuntu.srt.cn/ubuntu/ karmic main restricted universe multiverse
　　deb-src http://ubuntu.srt.cn/ubuntu/ karmic-security main restricted universe multiverse
　　deb-src http://ubuntu.srt.cn/ubuntu/ karmic-updates main restricted universe multiverse
　　deb-src http://ubuntu.srt.cn/ubuntu/ karmic-proposed main restricted universe multiverse
　　deb-src http://ubuntu.srt.cn/ubuntu/ karmic-backports main restricted universe multiverse
　　deb http://security.ubuntu.com/ubuntu karmic-security main restricted
　　deb-src http://security.ubuntu.com/ubuntu karmic-security main restricted
　　deb http://security.ubuntu.com/ubuntu karmic-security universe
　　deb-src http://security.ubuntu.com/ubuntu karmic-security universe
　　deb http://security.ubuntu.com/ubuntu karmic-security multiverse
　　deb-src http://security.ubuntu.com/ubuntu karmic-security multiverse
　　修改更新源文件
　　sudo gedit /etc/apt/sources.list
　　保存退出即可！