keytab: 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/share/gfxboot/bin/keytab - from package: gfxboot-dev

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

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