kvno: 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/kvno - from package: krb5-workstation

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

On Debian possible default full paths are:

/usr/bin/kvno - from package: krb5-user

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

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