kpropd: 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/sbin/kpropd - from package: krb5-server

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

On Debian possible default full paths are:

/usr/sbin/kpropd - from package: krb5-kdc

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

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