getpwnam("www") failed in /etc/nginx/nginx.conf

Solution 1:

The user you specified in your configuration, www, doesn't exist. Either create the user, or choose a user that does exist.

Solution 2:

Your other option (if you don't want to create a new user) is to replace the user field in nginx.conf with:

user nobody;

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Solution 3:

Create the www user. On Ubuntu this should be done using the following command and flags:

sudo adduser --system --no-create-home --shell /bin/false --group --disabled-login www