openpgp2spki: 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 CentOS possible default full paths are:

/usr/bin/openpgp2spki - from package: monkeysphere

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/openpgp2spki - from package: monkeysphere

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

Error in other languages:
openpgp2spki: bevel nie gevind nie
openpgp2spki: comandă negăsită
openpgp2spki: comando não encontrado
openpgp2spki: commande introuvable
openpgp2spki: command not found
openpgp2spki: käsku ei ole
openpgp2spki: không tìm thấy lệnh
openpgp2spki: komanda nerasta
openpgp2spki: Kommando nicht gefunden.
openpgp2spki: kommandot finns inte
openpgp2spki: komut yok
openpgp2spki: nie znaleziono polecenia
openpgp2spki: níor aimsíodh an t-ordú
openpgp2spki: no se encontró la orden
openpgp2spki: no s'ha trobat l'ordre
openpgp2spki: opdracht niet gevonden
openpgp2spki: parancs nem található
openpgp2spki: perintah tidak ditemukan
openpgp2spki: príkaz nenájdený
openpgp2spki: příkaz nenalezen
openpgp2spki: команда не найдена
openpgp2spki: командата не е открита
openpgp2spki: 命令找不到
openpgp2spki: コマンドが見つかりません