1、普通用户运行sudo，报错如下：

$ sudo
sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set

2、解决方法
2、使用root账户chown修改sudo权限

chown root:root /usr/bin/sudo && chmod 4755 /usr/bin/sudo

3、普通用户再运行sudo，还有可能报错：

$ sudo
sudo: error in /etc/sudo.conf, line 0 while loading plugin `sudoers_policy'
sudo: /usr/lib/sudo/sudoers.so must be only be writable by owner
sudo: fatal error, unable to load plugins

4、解决办法

chmod 644 /usr/lib/sudo/sudoers.so
chown -R root /usr/lib/sudo

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