For input to work on Nexus 5 (hammerhead), a udev rule has to be added using the following instructions:
Make the rootfs rw using the Ubuntu Touch Tweak Tool (UTTT)
Run this command on the device/over SSH:
echo 'ACTION=="add", KERNEL=="uinput", OWNER="system", GROUP="bluetooth", MODE="0660"' | sudo tee /lib/udev/rules.d/70-android_additional.rules
@c0n57an71n Ok thanks. should have been more precise: in fact what I'm most interested in is whether the cellular data works, i.e. whether the internet works with SIM (doesn't work at all for me with SIM on the Volla at the moment, ok with wifi) : so it's the conf managing best the SIM APN and cellular data that I want to test.