ktutil.heimdal: 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/ktutil.heimdal - from package: heimdal-clients

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

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