I am currently using Ubuntu and am 100% new to Unix. I have installed Ubuntu to program in C and will be using the "Learn C the Hard Way" online textbook (http://c.learncodethehardway.org/book/ex0.html). I attempted the section in the textbook meant for setting up your computer and the second command is causing me some problems.
The first command in the link above executes without issue but when I try and run the second command:
$ su -c yum groupinstall development-tools
it prompts me for my password and when I enter it, it says
su: Authentication Failure
How do I fix this?