What is the significance of the Nginx version (1.18) in relation to 502 Bad Gateway errors on Ubuntu?

While 502 errors are generally applicable across Nginx versions, Nginx 1.18 includes specific improvements and bug fixes related to upstream connections and error handling. Older versions might have less robust error recovery mechanisms. However, the root cause of the 502 is still likely to be related to the backend server or network, not the Nginx version itself.