numfmt: 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/bin/numfmt - from package: coreutils

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

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