petitboot-twin: 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/sbin/petitboot-twin - from package: petitboot-twin

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

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