certs2ldap.py: 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/certs2ldap.py - from package: pyca

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

Error in other languages:
certs2ldap.py: bevel nie gevind nie
certs2ldap.py: comandă negăsită
certs2ldap.py: comando não encontrado
certs2ldap.py: commande introuvable
certs2ldap.py: command not found
certs2ldap.py: käsku ei ole
certs2ldap.py: không tìm thấy lệnh
certs2ldap.py: komanda nerasta
certs2ldap.py: Kommando nicht gefunden.
certs2ldap.py: kommandot finns inte
certs2ldap.py: komut yok
certs2ldap.py: nie znaleziono polecenia
certs2ldap.py: níor aimsíodh an t-ordú
certs2ldap.py: no se encontró la orden
certs2ldap.py: no s'ha trobat l'ordre
certs2ldap.py: opdracht niet gevonden
certs2ldap.py: parancs nem található
certs2ldap.py: perintah tidak ditemukan
certs2ldap.py: príkaz nenájdený
certs2ldap.py: příkaz nenalezen
certs2ldap.py: команда не найдена
certs2ldap.py: командата не е открита
certs2ldap.py: 命令找不到
certs2ldap.py: コマンドが見つかりません