xt-guess-suite-and-mirror: 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/xt-guess-suite-and-mirror - from package: xen-tools

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

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