The system administrator wishes tu use John the Ripper to confirm that the passwords in a file called passwords are not weak. John has finished but the terminal window running the program has closed. What command can be used to list any cracked passwords for this file?

You are certain that your kernel has been compiled with ACL support, however, when you try to set an ACL on a file, you get the following output:

% setfacl m user:hugh:r afile.txt
setfacl: afile.txt: Operation not supported

What is the most likely reason for this problem?