convert_keylist: 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/convert_keylist - from package: opendkim-tools

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

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