What should I do if graphs and charts are unable to be displayed in a Linux Smart Monitor

If the graph or chart cannot be displayed on a Linux Smart Monitor, as the following image shows,

   

You may try to fix it by taking following steps:

  1. Install PHP-GD for Apache Web Server by the following command.
    # apt-get install php5-gd 
    or
    $ sudo apt-get install php5-gd

  2.  Restart Apache Web Server by command
    # /etc/init.d/apache2 restart

  3. Restart Smart Monitor
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