gpt: command not found

Have You tried accessing the binary with the full path?

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/gpt - from package: gpt

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