loki_ext: 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/loki_ext - from package: loki

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

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