I've been following the instructions in this answer for trying to read my iPhone from Ubuntu. I'm still getting the error in the question. Under Edit 2 of the answer it says to run
idevicepair unpair
But I tried that and just get
idevicepair: command not found
Tried installing idevicepair but no package can be located. What do I need to do to get my iPhone (3GS) working under Ubuntu (11.04)?
Try installing the package
libimobiledevice-utils
available in the software centeri.e.
in a terminal type: