3rd party plugins not showing in paper_lantern on v100

Symptoms

Certain 3rd party plugins may not show up in paper_lantern after installation on cPanel version 100.

Description 

On new installations of cPanel version 100, certain 3rd party plugins are not appearing in paper_lantern after plugin installation. This is because Jupiter has become the default theme. The /scripts/install_plugin script now defaults to Jupiter: 

# /scripts/install_plugin --help
install_plugin /path/to/plugin/archive

Installs features from the specified plugin archive.

Options:
--theme Theme to install the plugin to (default: jupiter).

Workaround

The plugin(s) will need to be manually installed for paper_lantern. 

1. Connect to your server using SSH as the root user
2. Install the plugin manually using the paper_lantern theme. The following command cannot be run as-is. You'll need to supply the '$path/to/the/plugin' with the actual path to the tar.gz file that holds the plugin:

/scripts/install_plugin $path/to/the/plugin.tar.gz --theme paper_lantern

Additional Information

The paper_lantern theme was deprecated in cPanel v110:

Paper Lantern Deprecation and Removal Schedule