Linux 收到消息“sudo：必须是 setuid root”，但 sudo 已经归 root 所有
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Getting message "sudo: must be setuid root", but sudo IS already owned by root
提问by Greg Dougherty
I'm trying to run sudo, and it's failing:
我正在尝试运行 sudo，但失败了：
gregd@david $ sudo ls
sudo: must be setuid root
gregd@david $ which sudo
/usr/bin/sudo
gregd@david $ ll /usr/bin/sudo
-rwxr-xr-x 1 root root 165K 2012-05-16 00:25 /usr/bin/sudo*
Any suggestions on how to fix this?
对于如何解决这个问题，有任何的建议吗？
采纳答案by Greg Dougherty
You have to be able to log in as root, but if you can you can run this
您必须能够以 root 身份登录，但如果可以，您可以运行它
chmod u+s /usr/bin/sudo
And fix the problem
并解决问题
回答by Adam
This problem is caused sometimes when the permissions of the file, /usr/bin/sudo get set to 777. If you do something like chmod -R 777 /usr/, you can do this. It effectively ruins sudo. Here is the solution if this is your problem, and the accepted answer doesn't work:
这个问题有时是因为文件的权限，/usr/bin/sudo 设置为777。如果你做类似的事情chmod -R 777 /usr/，你可以这样做。它有效地破坏了 sudo。如果这是您的问题，这是解决方案，并且接受的答案不起作用：
To fix:
修理：
Restart pc, press shift at boot menu.
重启电脑，在启动菜单按shift。
This should bring up GNU GRUB (ie recovery mode) menu.
这应该会调出 GNU GRUB（即恢复模式）菜单。
- If this doesn't work, just restart mid boot and choose recovery mode when prompted on next launch.
- 如果这不起作用，只需在启动中重新启动并在下次启动时出现提示时选择恢复模式。
Select the line which starts with Advanced options
选择以高级选项开头的行
Select the topmost version of the OS ending with ("recovery mode")
选择以（“恢复模式”）结尾的操作系统的最高版本
Press enter
按回车
In the following menu, go down to "Drop to root shell prompt"
在以下菜单中，转到“Drop to root shell prompt”
Type the following:
键入以下内容：
mount -o remount,rw /
mount --all
chown root:root /usr/bin/sudo
chmod 4755 /usr/bin/sudo
restart
This should restore sudo privellages.
这应该恢复 sudo privellages。
