pdf2brl: 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/pdf2brl - from package: liblouisxml-bin

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

Error in other languages:
pdf2brl: bevel nie gevind nie
pdf2brl: comandă negăsită
pdf2brl: comando não encontrado
pdf2brl: commande introuvable
pdf2brl: command not found
pdf2brl: käsku ei ole
pdf2brl: không tìm thấy lệnh
pdf2brl: komanda nerasta
pdf2brl: Kommando nicht gefunden.
pdf2brl: kommandot finns inte
pdf2brl: komut yok
pdf2brl: nie znaleziono polecenia
pdf2brl: níor aimsíodh an t-ordú
pdf2brl: no se encontró la orden
pdf2brl: no s'ha trobat l'ordre
pdf2brl: opdracht niet gevonden
pdf2brl: parancs nem található
pdf2brl: perintah tidak ditemukan
pdf2brl: príkaz nenájdený
pdf2brl: příkaz nenalezen
pdf2brl: команда не найдена
pdf2brl: командата не е открита
pdf2brl: 命令找不到
pdf2brl: コマンドが見つかりません