I have this 150Gb compressed file I accidentally deleted on an ext4 file system (running Ubuntu 16.04). Unfortunately, I only realized my mistake after a couple of days and about as many reboots. I burnt a LiveCD and tried this:
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
What're my options at this point?