prn2ps: 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/prn2ps - from package: sdf

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

Error in other languages:
prn2ps: bevel nie gevind nie
prn2ps: comandă negăsită
prn2ps: comando não encontrado
prn2ps: commande introuvable
prn2ps: command not found
prn2ps: käsku ei ole
prn2ps: không tìm thấy lệnh
prn2ps: komanda nerasta
prn2ps: Kommando nicht gefunden.
prn2ps: kommandot finns inte
prn2ps: komut yok
prn2ps: nie znaleziono polecenia
prn2ps: níor aimsíodh an t-ordú
prn2ps: no se encontró la orden
prn2ps: no s'ha trobat l'ordre
prn2ps: opdracht niet gevonden
prn2ps: parancs nem található
prn2ps: perintah tidak ditemukan
prn2ps: príkaz nenájdený
prn2ps: příkaz nenalezen
prn2ps: команда не найдена
prn2ps: командата не е открита
prn2ps: 命令找不到
prn2ps: コマンドが見つかりません