x2x: 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/x2x - from package: x2x

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

Error in other languages:
x2x: bevel nie gevind nie
x2x: comandă negăsită
x2x: comando não encontrado
x2x: commande introuvable
x2x: command not found
x2x: käsku ei ole
x2x: không tìm thấy lệnh
x2x: komanda nerasta
x2x: Kommando nicht gefunden.
x2x: kommandot finns inte
x2x: komut yok
x2x: nie znaleziono polecenia
x2x: níor aimsíodh an t-ordú
x2x: no se encontró la orden
x2x: no s'ha trobat l'ordre
x2x: opdracht niet gevonden
x2x: parancs nem található
x2x: perintah tidak ditemukan
x2x: príkaz nenájdený
x2x: příkaz nenalezen
x2x: команда не найдена
x2x: командата не е открита
x2x: 命令找不到
x2x: コマンドが見つかりません