To add a new extension pack, use VBoxManage extpack install <tarball>. This command will fail if an older version of the same extension pack is already installed. The optional --replace parameter can be used to uninstall the old package before the new package is installed.

To remove a previously installed extension pack, use VBoxManage extpack uninstall <name>. You can use VBoxManage list extpacks to show the names of the extension packs which are currently installed; please see Section 8.3, “VBoxManage list” also. The optional --force parameter can be used to override the refusal of an extension pack to be uninstalled.

The VBoxManage extpack cleanup command can be used to remove temporary files and directories that may have been left behind if a previous install or uninstall command failed.