Ubuntu 16.04 + Bitnami WP AWS+ Webmin 安装失败 + E: Package [] has no installation Candidate

我在Bitnami 的支持论坛上也有一个开放线程。我已经通过 AWS 市场安装了由 Bitnami 认证的 WordPress 多站点。

我正在尝试安装 webmin （或任何软件包，真的）并且不能

通过 SSH，我运行：

sudo apt-get update

sudo apt-get install perl libnet-ssleay-perl openssl libauthen-pam-perl libpam-runtime libio-pty-perl apt-show-versions python

哪个输出：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libnet-ssleay-perl 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

Package libauthen-pam-perl 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

Package libio-pty-perl 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

Package apt-show-versions 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

Package python 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 'libnet-ssleay-perl' has no installation candidate
E: Package 'libauthen-pam-perl' has no installation candidate
E: Package 'libio-pty-perl' has no installation candidate
E: Package 'apt-show-versions' has no installation candidate
E: Package 'python' has no installation candidate

我已经尝试了一堆修复，似乎 /etc/apt/sources.list 中需要调整一些东西......奇怪的是这个文件是空的。

我也试过

nano /etc/apt/sources.list

deb http://download.webmin.com/download/repository sarge contrib

...然后..

sudo apt-get -f install webmin

...输出

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 webmin : Depends: libnet-ssleay-perl but it is not installable
          Depends: libauthen-pam-perl but it is not installable
          Depends: libio-pty-perl but it is not installable
          Depends: apt-show-versions but it is not installable
          Depends: python but it is not installable
E: Unable to correct problems, you have held broken packages.

先感谢您！