nftldump: 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/nftldump - from package: mtd-utils

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

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