I've searched the entire block device for the string /usr/share/click/preinstalled/com.ubuntu.music/1.3.625/apparmor.json and tagged it in such a way as it is obvious it that it has been modified on the flash drive. I rebooted and double checked - the modified data is still modified on disk however the corrupted file contains the original data.
So the underlying file system is sane. The in-memory view of the file seems borked.
I've searched the entire block device for the string /usr/share/ click/preinstal led/com. ubuntu. music/1. 3.625/apparmor. json and tagged it in such a way as it is obvious it that it has been modified on the flash drive. I rebooted and double checked - the modified data is still modified on disk however the corrupted file contains the original data.
So the underlying file system is sane. The in-memory view of the file seems borked.