Through the iPhone 4 series, MX Linux is able to mount an iPhone in Thunar and reveal its contents for manipulation. Since iOS 5.0, iPhones will not allow a Linux installation to be recognized as a “trusted connection.” File transfer is still possible via an Apple wifi file transfer app or a cloud storage service. See also Section 4.2.
A successful strategy was described for iPhone 6 in this tutorial, but as of this writing it no longer appears to work. Users interested in trying to pursue that should install the package mx-iphone, pair with the command idevicepair pair and then try to continue with mounting iFuse.
The good news: photos can be retrieved by opening Shotwell with the phone attached, then clicking on the link that appears under Cameras. Note that the phone link may not work in Thunar.