Using ios_webkit_debug_proxy on linux
It isn't clear to me if you switch the browser to localhost:9222/ after you get a pair of lines like:
Listing devices on :9221Connected :9222 to Will's iPhone (8a48ac86edd4f299xxxxxxxxxxxxxxx)if you don't see the second line, then it means that probably you have issues with usbmuxd or libimobiledevice.
I've had some issues myself with the proxy, but then i was able to use it with satisfaction. In my experience, there are few things that make the life easier:
1) Run the usbmuxd as root and possibly with options -fv so that it doesn't detach from the tty and you see what happens. In my Debian installation it is run wit a system user in background;
2) In order to avoid the crash of the proxy when an unhandled exception happens don't use the debugger release of your chrome/chromium but instead use a pretty older one https://chrome-devtools-frontend.appspot.com/static/18.0.1025.99/devtools.html (see https://github.com/google/ios-webkit-debug-proxy/issues/63)