apt-cache 从 /var/lib/dpkg/status 中提取 - 我该如何防止这种情况？

Question

我正在尝试从旧版本的 Ubuntu (Artful) 编译一些依赖项信息。基本上，我通过将以下几行添加到我的 /etc/var/sources.list 来下载旧版本的内容：

deb http://old-releases.ubuntu.com/ubuntu/ artful main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ artful-updates main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ artful-security main restricted universe multiverse

然后，在我执行 sudo apt-get update 之后，这些文件就出现在我的 /var/lib/apt/lists 目录中。一切都很好。然后我将这些行移动到它们自己的文件中，我将其称为 artful_sources.list，并在源文件目录已更改的包上运行 apt-cache：

apt-cache -o Dir::Etc::SourceList=/etc/apt/artful_sources.list showpkg accountsservice > accountsservice.txt

当我查看结果时，我当然会看到 Artful 的版本，但我还会看到 Bionic（我已将其安装在我的系统上）的最新版本，它似乎是从 /var/lib/dpkg/status 中提取的。我只想要 Artful 软件包中的依赖项。这是怎么回事？我还可以更改哪些其他选项以使 apt-cache 不出现在状态文件中？

该示例的结果如下：

Package: accountsservice
Versions:
0.6.45-1ubuntu1 (/var/lib/dpkg/status)
 Description Language:
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful_main_binary-amd64_Packages
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language: en
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful_main_i18n_Translation-en
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language:
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful-updates_main_binary-amd64_Packages
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language:
                 File: /var/lib/dpkg/status
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e

0.6.42-0ubuntu3.1 (/var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful-updates_main_binary-amd64_Packages)
 Description Language:
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful_main_binary-amd64_Packages
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language: en
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful_main_i18n_Translation-en
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language:
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful-updates_main_binary-amd64_Packages
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language:
                 File: /var/lib/dpkg/status
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
0.6.42-0ubuntu3 (/var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful_main_binary-amd64_Packages)
 Description Language:
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful_main_binary-amd64_Packages
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language: en
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful_main_i18n_Translation-en
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language:
                 File: /var/lib/apt/lists/old-releases.ubuntu.com_ubuntu_dists_artful-updates_main_binary-amd64_Packages
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e
 Description Language:
                 File: /var/lib/dpkg/status
                  MD5: 8aeed0a03c7cd494f0c4b8d977483d7e


Reverse Depends:
  unity-settings-daemon,accountsservice 0.6.34
  mugshot,accountsservice
  liblightdm-gobject-1-0,accountsservice
  indicator-sound,accountsservice
  libaccountsservice0,accountsservice 0.6.5
  gnome-control-center,accountsservice
  gdm3,accountsservice 0.6.35
  language-selector-common,accountsservice 0.6.29-1ubuntu6
  unity-settings-daemon,accountsservice 0.6.34
  libaccountsservice0,accountsservice 0.6.5
  language-selector-common,accountsservice 0.6.29-1ubuntu6
  gnome-control-center,accountsservice

等等。在本例中，0.6.45-1ubuntu1 当前安装在 Bionic 上，其他版本 0.6.42-0ubuntu3 和 3.1 分别来自 artful 和 artful-updates。