How Do I install Nagios Plugin?

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http://askubuntu.com – I have installed Nagios in my ec2 server. Now I want to install check_snmp plugin. I found that this is not available in : /usr/local/nagios/libexec I tried : sudo apt-get install nagios-plugins-snmp But I'm getting : E: Unable to locate package nagios-plugins-snmp How can I install the plugins? Thanks in advance. (HowTos)