cups-calibrate: 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/cups-calibrate - from package: gutenprint-cups

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

On Debian possible default full paths are:

/usr/bin/cups-calibrate - from package: printer-driver-gutenprint

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

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