I am recently upgraded Ubuntu Server 20.04 to Ubuntu Server 22.04. It is a LEMP server running the latest Mainline version of Nginx. After the upgrade, when I try modifying the /etc/nginx/nginx.conf file with nano editor, nano shows a warning in red that says
/etc/nginx/nginx.conf is meant to be read-only
What is this error about, and since when is my nginx.conf file meant to be read-only? Is this an nginx issue, a nano issue, or a filesystem permissions issue, or all of the above? What can I do to fix this error? Please see screenshot below.