Sorry, this might be very simple and not strictly ubuntu-related, but this did happen with my up-to-date ubuntu 24.04.4 (most recent point release, I'd need to check) LTS, I guess that leads us to coreutils 9.4-3ubuntu6.2. I had trouble with the microSD card of my phone, but suspected the phone to be the problem rather than the card. I switched phone, but before using the SD card, I backed up the relevant data on my NTFS-formatted external hard...
Originally asked by Philippe Seidel on Stack Exchange (askubuntu) (CC BY-SA 4.0).
