Ubuntu system, accidentally deleted /usr/bin/env, with extundelete prompt as follows

  question, ruby

Enter command

extundelete /usr/bin/ –restore-all

The results are as follows

extundelete: “/usr/bin/” is a directory. You need to use the raw filesystem device (or a copy thereof).
extundelete: Operation not permitted when trying to open filesystem /usr/bin/

Is the catalog wrong?

The reason why it cannot be used has been found. It must be the name of the first column of df -h. It cannot be a folder.
But I didn’t restore the files I wanted. .