[mlaggner]

if you mount it via nautilus, you probably use gvfs to mount (bad choice, but the easiest one). Under Ubuntu the mount point should appear at 

Code:

/run/user/<user-uid>/gvfs/

You can also find that if you mount via nautilus and run the command 

Code:

cat /etc/mtab

 

here you see all mounted file systems.
But (to speak from experience) you should figure oout how to mount it via /etc/fstab! its much more stable and fast than gvfs/fuse