делаем так $rmlint /
==> In total 210152 files, whereof 18431 are duplicates in 5496 groups.
==> This equals 143,71 MB of duplicates which could be removed.
==> 63742 other suspicious item(s) found, which may vary in size.
Откуда в дефолтной системе он cмог столько дубликатов найти?