How to block a common user use startx command?

Question

How can I block a common user use startx command when he login? And leave just root user use startx after login?

Answer 1

The propably simplest way is to change the ownership of the startx binary (normally in /usr/bin/startx) in a way that only the owner (root) can execute that file. You can do this e.g. by entering sudo chmod 0744 /usr/bin/startx into a terminal.