On the Uninstall From Nodes screen you can uninstall the template specified in the Template to Uninstall section from any Hardware Node(s) registered in Infrastructure Manager, or, to use another term, Virtuozzo Group Hardware Nodes. The template will be uninstalled from the Hardware Nodes which which you may choose in the Select Hardware Nodes section: click Add and select Nodes from the pop-up window. Click Uninstall. .
Note : If any Container on your Hardware Nodes is based on the OS template you wish to delete, the OS template deletion will fail.