mount.exfat-fuse: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/sbin/mount.exfat-fuse - from package: exfat-fuse

You may install the required package with command apt-get install {package}

Error in other languages:
mount.exfat-fuse: bevel nie gevind nie
mount.exfat-fuse: comandă negăsită
mount.exfat-fuse: comando não encontrado
mount.exfat-fuse: commande introuvable
mount.exfat-fuse: command not found
mount.exfat-fuse: käsku ei ole
mount.exfat-fuse: không tìm thấy lệnh
mount.exfat-fuse: komanda nerasta
mount.exfat-fuse: Kommando nicht gefunden.
mount.exfat-fuse: kommandot finns inte
mount.exfat-fuse: komut yok
mount.exfat-fuse: nie znaleziono polecenia
mount.exfat-fuse: níor aimsíodh an t-ordú
mount.exfat-fuse: no se encontró la orden
mount.exfat-fuse: no s'ha trobat l'ordre
mount.exfat-fuse: opdracht niet gevonden
mount.exfat-fuse: parancs nem található
mount.exfat-fuse: perintah tidak ditemukan
mount.exfat-fuse: príkaz nenájdený
mount.exfat-fuse: příkaz nenalezen
mount.exfat-fuse: команда не найдена
mount.exfat-fuse: командата не е открита
mount.exfat-fuse: 命令找不到
mount.exfat-fuse: コマンドが見つかりません