It's important to use Ubuntu permission settings

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have been using Ubuntu recently, a few days ago due to accidentally executed

sudo chown-hr root:root/

Causes the system to not update

and unable to use the Sudu command, almost completely paralyzed. Because the server has been a remote operation, it cannot operate directly or enter Repair mode

So I looked everywhere for information. The result is nothing, only to the computer room for operation.

In repair mode, modify the properties of the/etc/to 641, and then start,

Still can't use sudo

Hint Sudoer permissions are problematic

Go back to repair mode, fix sudo mode

After entering the system, we found that MySQL was not connected, so I continued to fix the properties of the prompt file.

These 2 times are good. But the system is still wrong, PHP error.

It seems that the operation requires absolute caution

Decide to back up the data and reinstall it on the day.