x2goversion: 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/x2goversion - from package: x2goserver

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

Error in other languages:
x2goversion: bevel nie gevind nie
x2goversion: comandă negăsită
x2goversion: comando não encontrado
x2goversion: commande introuvable
x2goversion: command not found
x2goversion: käsku ei ole
x2goversion: không tìm thấy lệnh
x2goversion: komanda nerasta
x2goversion: Kommando nicht gefunden.
x2goversion: kommandot finns inte
x2goversion: komut yok
x2goversion: nie znaleziono polecenia
x2goversion: níor aimsíodh an t-ordú
x2goversion: no se encontró la orden
x2goversion: no s'ha trobat l'ordre
x2goversion: opdracht niet gevonden
x2goversion: parancs nem található
x2goversion: perintah tidak ditemukan
x2goversion: príkaz nenájdený
x2goversion: příkaz nenalezen
x2goversion: команда не найдена
x2goversion: командата не е открита
x2goversion: 命令找不到
x2goversion: コマンドが見つかりません