t2html: 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/t2html - from package: t2html

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

Error in other languages:
t2html: bevel nie gevind nie
t2html: comandă negăsită
t2html: comando não encontrado
t2html: commande introuvable
t2html: command not found
t2html: käsku ei ole
t2html: không tìm thấy lệnh
t2html: komanda nerasta
t2html: Kommando nicht gefunden.
t2html: kommandot finns inte
t2html: komut yok
t2html: nie znaleziono polecenia
t2html: níor aimsíodh an t-ordú
t2html: no se encontró la orden
t2html: no s'ha trobat l'ordre
t2html: opdracht niet gevonden
t2html: parancs nem található
t2html: perintah tidak ditemukan
t2html: príkaz nenájdený
t2html: příkaz nenalezen
t2html: команда не найдена
t2html: командата не е открита
t2html: 命令找不到
t2html: コマンドが見つかりません