plpprintd: 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/sbin/plpprintd - from package: plptools

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

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