https://itsfoss.com/mount-exfat/

https://vitux.com/how-to-manually-mount-unmount-a-usb-device-on-ubuntu/

// first install exFAT file system support
$ sudo add-apt-repository universe
$ sudo apt update
$ sudo apt install exfat-fuse exfat-utils

// you may have to unplug USB drive and plug again
$ sudo fdisk -l
...
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 33553920 bytes
Disklabel type: dos
Disk identifier: 0xcda8f4bf

Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 1953522112 1953520065 931.5G 7 HPFS/NTFS/exFAT

$ sudo mkdir /media/usb0

// check your uid and use it
$ sudo mount -t exfat /dev/sda1 /media/usb0 -o uid=1000
FUSE exfat 1.2.8