Since updating to Catalina I haven't been able to do sudo. I'am an admin user, but every attempt to use sudo (such as
sudo visudo or
sudo vim /etc/sudoers) gives me this message
this user is not in the sudoers file. This incident will be reported.
I know that apple has creating a read only volume for the system. But when I go the the data volume in the terminal I get the same message.