org-ruby: 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/org-ruby - from package: ruby-org

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

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