html2utf8: 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/share/gfxboot/bin/html2utf8 - from package: gfxboot-dev

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

Error in other languages:
html2utf8: bevel nie gevind nie
html2utf8: comandă negăsită
html2utf8: comando não encontrado
html2utf8: commande introuvable
html2utf8: command not found
html2utf8: käsku ei ole
html2utf8: không tìm thấy lệnh
html2utf8: komanda nerasta
html2utf8: Kommando nicht gefunden.
html2utf8: kommandot finns inte
html2utf8: komut yok
html2utf8: nie znaleziono polecenia
html2utf8: níor aimsíodh an t-ordú
html2utf8: no se encontró la orden
html2utf8: no s'ha trobat l'ordre
html2utf8: opdracht niet gevonden
html2utf8: parancs nem található
html2utf8: perintah tidak ditemukan
html2utf8: príkaz nenájdený
html2utf8: příkaz nenalezen
html2utf8: команда не найдена
html2utf8: командата не е открита
html2utf8: 命令找不到
html2utf8: コマンドが見つかりません