hte: command not found

Have You tried accessing the binary with the full path?

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/hte - from package: ht

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