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

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

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