After assigning a user su rights including access to linuxconf, I exit, log in as the new user, open terminal, issue "su" and enter root password. The problem is that access to linuxconf is not allowed "command not found", even when I enter the directory where linuxconf is located I receive the same error.
Your PATH does not change unless you use "su -" to get root access. The current directory is not in the default PATH (as a security measure). Use "su -" and "linuxconf" to start linuxconf, or "su", and "/sbin/linuxconf".