It seems that akonadi does not create the file_lost+found directory which results in "akonadictl fsck" failing to move files there. See here: https://github.com/KDE/akonadi/blob/ed93384ff692a684a1ade9bbc283ba495c0b3fe3/src/server/storagejanitor.cpp#L460-L466 There isn't anything that creates the directory. In my case, I was running fsck continuously without any effect. The result was like this: Found unreferenced external file: /home/v13/.local/share/akonadi/file_db_data/56/5634856_r0 Found unreferenced external file: /home/v13/.local/share/akonadi/file_db_data/27/7826627_r0 Found unreferenced external file: /home/v13/.local/share/akonadi/file_db_data/08/5711008_r1 And then: Moved 105853 unreferenced files to lost+found. But nothing was being moved. Then, once I created it by hand, it moved 3.8GB I tried restarting akonadi in case it creates the directory, but nothing I'm using akonadi server 4:18.08.3-7 (debian testing).
(In reply to Stefanos Harhalakis from comment #0) > I'm using akonadi server 4:18.08.3-7 (debian testing). That's not "GIT (master)" though, but rather 5.9.3 (which is over a year old and no longer available in bugzilla's version field). The problem however was fixed already in 18.12.1 (5.10.1): https://cgit.kde.org/akonadi.git/commit/?id=28f2916db1a2ad98b00250eb4d5dd92ca1548c50