gtml: 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/gtml - from package: gtml

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

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