lunch-slave: 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/lunch-slave - from package: python-lunch

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

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