Ubuntu – How to install and mount an exFAT partition?

mount is not allowed in the late releases of udev. Better to go with udisks if you are using Gnome/Unity or any other alternative for other DE.

man udev

RUN

Note that running programs that access the network or mount/unmount filesystems is not allowed inside of udev rules, due to the default sandbox that is enforced on systemd-udevd.service.

After some trial and errors, I've been able to format an exFAT partition on Ubuntu that is working on Windows 10. The trick is to add the msftdata flag on the partition (regardless if partition is aligned or not):

 sudo parted <DEVICE> set <PARTITION_NUMBER> msftdata on

For example:

 sudo parted /dev/sde set 1 msftdata on

And it worked for me in Windows 10!

And in case it helps someone, this is how I created a single aligned exFAT partition in the first place:

 sudo parted /dev/sde mklabel gpt
 sudo parted -a optimal /dev/sde mkpart primary '0%' '100%'
 sudo mkfs.exfat /dev/sde1