Additional information from https://bugs.launchpad.net/ubuntu/+source/usbmuxd/+bug/546492/comments/5 : it seems that python (or a python program) lock the file, which cause this crash.
Additional information from https:/ /bugs.launchpad .net/ubuntu/ +source/ usbmuxd/ +bug/546492/ comments/ 5 : it seems that python (or a python program) lock the file, which cause this crash.