Comment 11 for bug 877440

The segfault is an obvious bug to solve. Until then the wworkaround that worked for me can be found here:

http://ubuntuforums.org/showpost.php?p=11350062&postcount=2

It boils down to the unpair-pair sequence:

sudo apt-get install libimobiledevice-utils
idevicepair unpair && idevicepair pair