Enable “Team Sites” in SharePoint 2013 “Publishing Site”

If you created a site collection based on the publishing site, by default SharePoint 2013 does not show the Team Site template.

To enable the Team Site template:

1. Site Settings >>  Page Layout and Site Template Settings (under Look and Feel)
2. Under “Subsite Templates”, add the "Team Site (All)" entry
3. Save by clicking on the “OK” button