partclone.vfat: 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:

/usr/sbin/partclone.vfat - from package: partclone

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

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