title: printk() doesn't print in /var/log/messages
body: <p>My OS Ubuntu 12.04. I wrote this Kernel Module and i use insmod and rmmod command but there isn't anything in /var/log messages. how can i fix this problem?</p>
  
  <pre><code>/*  
  *  hello-1.c - The simplest kernel module.
  */
  #include &lt;linux/module.h&gt;   /* Needed by all modules */
  #include &lt;linux/kernel.h&gt;   /* Needed for KERN_INFO */
  
  int init_module(void)
  {
     printk(KERN_INFO "Hello world 1.\n");
  
      /* 
      * A non 0 return means init_module failed; module can't be loaded. 
      */
      return 0;
   }
  
   void cleanup_module(void)
   {
     printk(KERN_INFO "Goodbye world 1.\n");
   }
  </code></pre>