slurmctld: 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/slurmctld - from package: slurmctld

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

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