我错误地对/etc. 现在它给了我以下错误消息：
bash: /etc/bash.bashrc: Permission denied
I have no name!@chandan-Inspiron-5520:~$ sudo /etc/init.d/apache2 restart
sudo: unable to stat /etc/sudoers: Permission denied
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin