How do I mount my Samsung galaxy s4 on ubuntu? I'm running ubuntu 12.04 and have a rooted samsung galaxy s4.  The s4 is still 2 software versions back since I need to unroot to update and just havent had the time or energy to do all of the work to get back to where I'm setup.  I think it is 4.2.something.  

So when I plug my S4 into ubuntu via usb I get an error message

"Unable to mount SAMSUNG_Android
Error initializing camera:-60: could not lock the device"

With my rooted kindle I run gMTP and that gets me access so I tried it with the S4 and it says nothing is available to connect.

With my old evo I had no trouble.  Even when it wasn't rooted I had access to the sd card just like any other drive being mounted.  What's the deal with this s4?

I do have usb debugging enabled.
Open a terminal in ubuntu(ctrl+alt+t) and type this commands:

sudo add-apt-repository ppa:langdalepl/gvfs-mtp
sudo apt-get update


Then, launch Software Updater (previously known as Update Manager) and install the available updates.
Afther you pdate everything restart pc.

if you want to revert back before making any changes:

sudo ppa-purge ppa:langdalepl/gvfs-mtp


Next time, I think you should ask this is askubuntu.com since it is more of a linux specific problem then android.