pdbtxt2html: 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/pdbtxt2html - from package: txt2pdbdoc

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

Error in other languages:
pdbtxt2html: bevel nie gevind nie
pdbtxt2html: comandă negăsită
pdbtxt2html: comando não encontrado
pdbtxt2html: commande introuvable
pdbtxt2html: command not found
pdbtxt2html: käsku ei ole
pdbtxt2html: không tìm thấy lệnh
pdbtxt2html: komanda nerasta
pdbtxt2html: Kommando nicht gefunden.
pdbtxt2html: kommandot finns inte
pdbtxt2html: komut yok
pdbtxt2html: nie znaleziono polecenia
pdbtxt2html: níor aimsíodh an t-ordú
pdbtxt2html: no se encontró la orden
pdbtxt2html: no s'ha trobat l'ordre
pdbtxt2html: opdracht niet gevonden
pdbtxt2html: parancs nem található
pdbtxt2html: perintah tidak ditemukan
pdbtxt2html: príkaz nenájdený
pdbtxt2html: příkaz nenalezen
pdbtxt2html: команда не найдена
pdbtxt2html: командата не е открита
pdbtxt2html: 命令找不到
pdbtxt2html: コマンドが見つかりません