exfatlabel: 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/exfatlabel - from package: exfat-utils

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

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