我想访问“sudoers”文件并访问“su -”但我失败并出现以下错误请检查我尝试过的终端输出。我是 m-usman(admin) 但不允许编辑或访问?:(
m-usman@muhammad-usman:~$ sudo gedit /etc/sudoers
[sudo] password for m-usman:
m-usman is not in the sudoers file. This incident will be reported.
m-usman@muhammad-usman:~$ su -
Password:
su: Authentication failure
m-usman@muhammad-usman:~$ sudo visudo
[sudo] password for m-usman:
m-usman is not in the sudoers file. This incident will be reported.
我该如何解决?