lush: 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/lush - from package: lush

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

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