我在 ext4 文件系统（运行 Ubuntu 16.04）上意外删除了这个 150Gb 的压缩文件。不幸的是，我几天后才意识到自己的错误，并且重启了好几次。我刻录了一张 LiveCD 并尝试了以下操作：
ubuntu@ubuntu:~$ sudo extundelete /dev/sda3 --restore-file really_big_compressed_file.xz
NOTICE: Extended attributes are not restored.
Loading filesystem metadata ... 7189 groups loaded.
Loading journal descriptors ... 30218 descriptors loaded.
Unable to restore inode 19017642 (really_big_compressed_file.xz): No undeleted copies found in the journal.
Unable to restore file really_big_compressed_file.xz
extundelete: Operation not permitted while restoring file.
extundelete: Operation not permitted when trying to examine filesystem
我现在有什么选择？