正在尝试使用 Ubuntu xenial 来运行 php，但我需要获取特定扩展的 php 源代码。尝试这样做时，我得到：
$ sudo apt-get source php7.0
> dpkg-source: not found
谷歌搜索显示应该包含在内dpkg-dev，它似乎是为 ubuntu 16.x 列出的，但我收到错误：
$ sudo apt-get install dpkg-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package dpkg-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'dpkg-dev' has no installation candidate
我不确定我遗漏了什么。现在还有其他东西可以提供 dpkg-source 吗？
编辑：输出sudo apt update
Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
这是我的来源列表：
deb-src http://us.archive.ubuntu.com/ubuntu/ xenial main
答案1
已解决，通过将以下内容添加到我的/etc/apt/sources.list：
deb http://us.archive.ubuntu.com/ubuntu/ xenial main