x11-touchscreen-calibrator: 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/x11-touchscreen-calibrator - from package: x11-touchscreen-calibrator

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

Error in other languages:
x11-touchscreen-calibrator: bevel nie gevind nie
x11-touchscreen-calibrator: comandă negăsită
x11-touchscreen-calibrator: comando não encontrado
x11-touchscreen-calibrator: commande introuvable
x11-touchscreen-calibrator: command not found
x11-touchscreen-calibrator: käsku ei ole
x11-touchscreen-calibrator: không tìm thấy lệnh
x11-touchscreen-calibrator: komanda nerasta
x11-touchscreen-calibrator: Kommando nicht gefunden.
x11-touchscreen-calibrator: kommandot finns inte
x11-touchscreen-calibrator: komut yok
x11-touchscreen-calibrator: nie znaleziono polecenia
x11-touchscreen-calibrator: níor aimsíodh an t-ordú
x11-touchscreen-calibrator: no se encontró la orden
x11-touchscreen-calibrator: no s'ha trobat l'ordre
x11-touchscreen-calibrator: opdracht niet gevonden
x11-touchscreen-calibrator: parancs nem található
x11-touchscreen-calibrator: perintah tidak ditemukan
x11-touchscreen-calibrator: príkaz nenájdený
x11-touchscreen-calibrator: příkaz nenalezen
x11-touchscreen-calibrator: команда не найдена
x11-touchscreen-calibrator: командата не е открита
x11-touchscreen-calibrator: 命令找不到
x11-touchscreen-calibrator: コマンドが見つかりません