Ubuntu 16.04 exfat mount with ntfs. 128gb SD cards example

How to Mount EXFAT partition on Ubuntu 16.04 LTS

To mount exfat partition on Ubuntu, simply install the necessary packages:
$ sudo apt-get install exfat-fuse exfat-utils

If you need to mount it from the command line, you could do
$ sudo mkdir /media/exfat
$ sudo mount -t exfat /dev/sdxx /media/exfat
where /dev/sdxx could be /dev/sda1 or /dev/sda2, or so on.

If you are not sure whether the exfat partition you are looking for is /dev/sda1 or /dev/sda2, then you could also run
$ sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL

This should do it!

http://unixnme.blogspot.com/2016/04/how-to-mount-exfat-partition-in-ubuntu.html 

The ghome-disks utility can also be used to start and mount this.  Since it is /dev/mmc and not /dev/sd, the system will probably have it assumed to be system owned, and will mount under root ownership only.

You can follow the above, but will then have to do a lot of crap with permissions to the mount.  If it were or is a fixed mount and not the automount /media mechanism one can do that once.  However it will be reset on every mount and be inconvenient.

Solution might be to use gnome-disks.  That has a problem however.  The FUSE exfat driver and the above asset is root owned.  Gnome-disks will not access and mount it due to the system ownership problem

So use a utility to run gnome kit stuff from a command line as su root.

apt-get -y install gksu

installs the gksudo and other stuff.

gksudo gnome-disks will mount the device and make it properly available.

Note that sudo gnome-disks makes the thing root owned again, since you are running as root user in the desktop.  gksudo will run as root, but effectivly as the user desktop user id.