loadavg: 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/loadavg - from package: dmucs
/usr/sbin/loadavg - from package: dmucs

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

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