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To install Security Onion, you can either download our Security Onion ISO image or download a standard Ubuntu 16.04 ISO image and then add our Security Onion PPA and packages. Please keep in mind that our PPA and packages are only compatible with Ubuntu 16.04.

ALWAYS verify the checksum of ANY downloaded ISO image! Regardless of whether you’re downloading our Security Onion ISO image or whether you’re starting with an Ubuntu 16.04 ISO image, you should ALWAYS verify the downloaded ISO image.

• If downloading our Security Onion 16.04 ISO image, please verify using these instructions: https://github.com/Security-Onion-Solutions/security-onion/blob/master/Verify_ISO.md
• If downloading an Ubuntu 16.04 ISO image, please verify using these instructions: https://help.ubuntu.com/community/VerifyIsoHowto