ekeydctl: command not found

Have You tried accessing the binary with the full path?

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/sbin/ekeydctl - from package: ekeyd

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