To add the correct repository:

sudo apt-add-repository ppa:relan/exfat

To update your package list:

sudo apt-get update

To install fuse-exfat and exfat-utils packages:

sudo apt-get install fuse-exfat exfat-utils

sudo apt-add-repository ppa:relan/exfat

sudo apt-get update

sudo apt-get install fuse-exfat exfat-utils

sudo apt-get install exfat-fuse exfat-utils