ptftopl: 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/ptftopl - from package: texlive-binaries

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

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