bibtex2html: 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/bibtex2html - from package: bibtex2html

You may install the required package with command apt-get install {package}
Error in other languages:
bibtex2html: bevel nie gevind nie
bibtex2html: comandă negăsită
bibtex2html: comando não encontrado
bibtex2html: commande introuvable
bibtex2html: command not found
bibtex2html: käsku ei ole
bibtex2html: không tìm thấy lệnh
bibtex2html: komanda nerasta
bibtex2html: Kommando nicht gefunden.
bibtex2html: kommandot finns inte
bibtex2html: komut yok
bibtex2html: nie znaleziono polecenia
bibtex2html: níor aimsíodh an t-ordú
bibtex2html: no se encontró la orden
bibtex2html: no s'ha trobat l'ordre
bibtex2html: opdracht niet gevonden
bibtex2html: parancs nem található
bibtex2html: perintah tidak ditemukan
bibtex2html: príkaz nenájdený
bibtex2html: příkaz nenalezen
bibtex2html: команда не найдена
bibtex2html: командата не е открита
bibtex2html: 命令找不到
bibtex2html: コマンドが見つかりません