running-in-container: 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/running-in-container - from package: upstart

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

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