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To remove an attribute from session using Thymeleaf in Spring Boot, you can use the following code:

1. In the Controller class:

@GetMapping("/removeSessionAttribute")
public String removeSessionAttribute(HttpSession session) {
    // remove the "someAttribute" from session
    session.removeAttribute("someAttribute");
    return "redirect:/home";
}

1. In the Thymeleaf template:

<a th:href="@{/removeSessionAttribute}" class="btn btn-primary">Remove Attribute</a>

This code will create a link/button, which will call the removeSessionAttribute() method in the controller to remove the specified attribute from session.