xmlroff: 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/xmlroff - from package: xmlroff

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

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