I tried using a
sudo command on my iMac to create a bootable version of Ubuntu, but when I run the command by pressing enter, I got the warning that the command might screw up my system, which I ignored.
I then received a message:
you are not in the sudoers file, the incident will be reported
and my Terminal window was then rendered useless, with the usual
$ not appearing so that I could type my commands.
What in the world is "sudoers", why is this happening and how can I put a stop to it?