live-system: 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:

/bin/live-system - from package: live-tools

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

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