+{%- if modules_to_enable != nil %}
+{% include 'notebox_begin_warning' %}
+
+Arvados tools require newer language runtimes than the default versions included with these distributions. These instructions will **upgrade language runtimes for the entire system**. Check that won't interfere with any existing software before you proceed.
+
+{% include 'notebox_end' %}
+{% endif -%}
+
+Set up the Arvados package repository
+{%- if packages_to_install == nil %}
+{%- elsif packages_to_install contains " " %} and install the packages
+{%- else %} and install @{{ packages_to_install }}@
+{%- endif %} by running these commands: