1、首先安装dpkg-dev：
????? apt-get install dpkg-dev?
2、设置资源的URL
进入?sudo?vim /etc/apt/sources.list? ，然后加入以下URL：
deb-src http://archive.ubuntu.com/ubuntu trusty main restricted #Added by software-properties
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty restricted main universe multiverse #Added by software-properties
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-updates restricted main universe multiverse #Added by software-properties
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse #Added by software-properties
deb-src http://security.ubuntu.com/ubuntu trusty-security restricted main universe multiverse #Added by software-properties
deb-src http://gb.archive.ubuntu.com/ubuntu/ trusty-proposed restricted main universe multiverse #Added by software-properties
?并执行命令：apt-get update
不然会报错：ubuntu?apt-get (You must put some ‘source’ URIs in your sources.list)
E: You must put some ‘source’ URIs in your sources.list
3、下载相应的源码，这里以ls为例
注意：最好在root下，运行下面命令
?（一）查找ls命令的位置 ，?执行：which ls
运行结果：/bin/ls
（二）?查找命令所在的包，执行：dpkg -S?/bin/ls
运行结果：coreutils: /bin/ls
（三）?下载源码，执行：apt-get source coreutils
（四）下载完成后，当前目录下面可以看到四个文件，其中coreutils-8.21是源码的目录，相应的源码在它里面?。
?
可能出现的错误：
W: Download is performed unsandboxed as root as file 'coreutils_8.21.orig.tar.gz' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
root@morun:/home/# ls
情况一：当前目录已经生成了三个文件，还差一个源码目录
?这时可以通过手动解压源码包，产生源码目录
执行：dpkg-source -x coreutils_8.21-1ubuntu5.4.dsc （你的xxx.dsc）
可能出现的错误
W: Download is performed unsandboxed as root as file 'coreutils_8.21.orig.tar.gz' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
root@morun:/home/hukejian# ls
?情况二：当前目录没有生成任何文件
方法：
一、执行：sudo chown _apt /var/lib/update-notifier/package-data-downloads/partial/
二、然后再执行一遍：apt-get source coreutils