I have installed gMTP and tried to follow this tutorial to solve this problem: http://www.webupd8.org/2013/01/upgrade-to-gvfs-with-mtp-support-in.html But neither worked. I tried to connect both my phone (Nexus 4) and my dad's phone (Galaxy Note 2), and neither is being detected by Ubuntu. They don't show up on my files and on gMTP. Is there another fix? or something more specific for Android 4.3 and Ubuntu 14.04