openuniverse: 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 CentOS possible default full paths are:

/usr/bin/openuniverse - from package: openuniverse

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/openuniverse - from package: openuniverse

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

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