Without the flag, apt will generate a list of packages available from all configured repositories. The flag instructs apt to only return installed packages. To list all installed packages with the apt command we use the list command with the–installed flag. The one you choose will depend on the version of Ubuntu and installed and how much information you need to document. There are two methods of listing installed packages on Ubuntu servers. When writing Ansible playbooks or Puppet modules, for example, of an existing server, it is important to have detailed documentation of the server’s configuration. One reason may be for audit and compliance reasons, perhaps you are about to venture into infrastructure as code. There are a variety of reasons why someone would want to list all installed packages on an Ubuntu Server install.
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