If the user deletes or moves the file in the Virtual Machines, it will prompt "Operation not permitted" error, and the operation will be unsuccessful, as shown in the following figure;
The related file was added with the i protection attribute causing the operation to fail.
Use the lsattr command to view the file attribute. You can see that the file has been added with the i attribute; this attribute indicates that the file cannot be modified or deleted.
Use the chattr command to delete the i attribute;
After deleting the i attribute, it will be normal when you operate this file again;