dtd2vim: 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/dtd2vim - from package: vim-scripts

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

Error in other languages:
dtd2vim: bevel nie gevind nie
dtd2vim: comandă negăsită
dtd2vim: comando não encontrado
dtd2vim: commande introuvable
dtd2vim: command not found
dtd2vim: käsku ei ole
dtd2vim: không tìm thấy lệnh
dtd2vim: komanda nerasta
dtd2vim: Kommando nicht gefunden.
dtd2vim: kommandot finns inte
dtd2vim: komut yok
dtd2vim: nie znaleziono polecenia
dtd2vim: níor aimsíodh an t-ordú
dtd2vim: no se encontró la orden
dtd2vim: no s'ha trobat l'ordre
dtd2vim: opdracht niet gevonden
dtd2vim: parancs nem található
dtd2vim: perintah tidak ditemukan
dtd2vim: príkaz nenájdený
dtd2vim: příkaz nenalezen
dtd2vim: команда не найдена
dtd2vim: командата не е открита
dtd2vim: 命令找不到
dtd2vim: コマンドが見つかりません