vagalumectl: 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/vagalumectl - from package: vagalume

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

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