x2gofm: 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/x2gofm - from package: x2goserver-fmbindings

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

Error in other languages:
x2gofm: bevel nie gevind nie
x2gofm: comandă negăsită
x2gofm: comando não encontrado
x2gofm: commande introuvable
x2gofm: command not found
x2gofm: käsku ei ole
x2gofm: không tìm thấy lệnh
x2gofm: komanda nerasta
x2gofm: Kommando nicht gefunden.
x2gofm: kommandot finns inte
x2gofm: komut yok
x2gofm: nie znaleziono polecenia
x2gofm: níor aimsíodh an t-ordú
x2gofm: no se encontró la orden
x2gofm: no s'ha trobat l'ordre
x2gofm: opdracht niet gevonden
x2gofm: parancs nem található
x2gofm: perintah tidak ditemukan
x2gofm: príkaz nenájdený
x2gofm: příkaz nenalezen
x2gofm: команда не найдена
x2gofm: командата не е открита
x2gofm: 命令找不到
x2gofm: コマンドが見つかりません