kvkbd: 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/kvkbd - from package: kvkbd

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

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