lu-sh: 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/lu-sh - from package: licenseutils

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

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