The -a means to run on all mounted filesystems, so the error could be from any of them. Try running it on each filesystem and see which one is causing the message ( which likely isn't your ntfs partition ).
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1516702 Title: fstrim on 30 GB ntfs partition says 16 EiB (18446744073709551615 bytes) trimmed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1516702/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs