pius-keyring-mgr: 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

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/pius-keyring-mgr - from package: pius

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