po2debconf: 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/po2debconf - from package: po-debconf

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

Error in other languages:
po2debconf: bevel nie gevind nie
po2debconf: comandă negăsită
po2debconf: comando não encontrado
po2debconf: commande introuvable
po2debconf: command not found
po2debconf: käsku ei ole
po2debconf: không tìm thấy lệnh
po2debconf: komanda nerasta
po2debconf: Kommando nicht gefunden.
po2debconf: kommandot finns inte
po2debconf: komut yok
po2debconf: nie znaleziono polecenia
po2debconf: níor aimsíodh an t-ordú
po2debconf: no se encontró la orden
po2debconf: no s'ha trobat l'ordre
po2debconf: opdracht niet gevonden
po2debconf: parancs nem található
po2debconf: perintah tidak ditemukan
po2debconf: príkaz nenájdený
po2debconf: příkaz nenalezen
po2debconf: команда не найдена
po2debconf: командата не е открита
po2debconf: 命令找不到
po2debconf: コマンドが見つかりません