kcm: 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/lib/debug/usr/sbin/kcm - from package: heimdal-dbg
/usr/sbin/kcm - from package: heimdal-kcm

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

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