sudo must be owned by uid 0 and have the setuid bit set错误处理

一不小心使用chmod 命令将sudo 文件属性改了，导致使用ｓｕｄｏ命令时出现下面错误：

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

参考了链接给出的解决方法，但是我没有设置root密码。最后按照下面方法设置了密码：

(2)需要输入root密码的难兄难弟们，请往下看。
重启的时候，进入ubuntu高级选项(有的系统是英文的，自己翻译，大概是Advanced options for ubuntu这样)，之后能看到recovery 啥啥啥的，按e进入，找到linux /boot/vmlinuz-----*** ro recovery nomodestset 这句话。
然后将ro recovery nomodestset啥啥啥一大串修改为 rw single init=/bin/bash，然后ctrl+x进入单人模式。(此时，想要更改root密码的输入passwd <密码>，之后再确认一次就更改成功)

然后重启进入Ubuntu, terminal 中输入下面命令

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

最后解决问题。。

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sudo must be owned by uid 0 and have the setuid bit set错误处理

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