kredentials: 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/kredentials - from package: kredentials

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

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