Security Onion 16.04 has reached End Of Life:
https://blog.securityonion.net/2021/04/security-onion-1604-has-reached-end-of.html
You can find the new Security Onion 2 repo at:
https://github.com/Security-Onion-Solutions/securityonion/
Security Onion 16.04 has reached End Of Life:
https://blog.securityonion.net/2021/04/security-onion-1604-has-reached-end-of.html
You can find the new Security Onion 2 repo at:
https://github.com/Security-Onion-Solutions/securityonion/