Debian 11 Bullseye安装Puppetserver失败：puppet-agent依赖无法安装

我按照Puppet官方文档步骤在Debian 11 Bullseye上安装Puppetserver，执行最终安装命令时失败，报错信息如下：

# apt-get install puppetserver
Reading package lists... Done
Building dependency tree... Done
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:
 puppetserver : Depends: puppet-agent (>= 6.16.0) but it is not installable
E: Unable to correct problems, you have held broken packages.

排查细节：

• 执行aptitude search puppet-agent无结果，puppet-agent包无法被系统解析
• 已确认Puppet软件源配置正确：

  # cat /etc/apt/sources.list.d/puppet7.list 
  # Puppet 7 bullseye Repository
  deb http://apt.puppetlabs.com bullseye puppet7
  

• 操作系统版本为Debian 11 Bullseye：

  $ cat /etc/os-release | grep VERSION
  VERSION_ID="11"
  VERSION="11 (bullseye)"
  VERSION_CODENAME=bullseye
  

恳请提供解决方法或排查提示。

内容的提问来源于stack exchange，提问作者Christian