java solution:

public static SinglyLinkedListNode removeDuplicates(SinglyLinkedListNode llist) {
    SinglyLinkedList newList = new SinglyLinkedList();
    while ( llist != null ) {
        if (newList.tail == null || newList.tail.data != llist.data ) {
            newList.insertNode(llist.data);
        }
        llist = llist.next;
    }
    return newList.head;
}