bib2html: 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/bib2html - from package: nbibtex

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

Error in other languages:
bib2html: bevel nie gevind nie
bib2html: comandă negăsită
bib2html: comando não encontrado
bib2html: commande introuvable
bib2html: command not found
bib2html: käsku ei ole
bib2html: không tìm thấy lệnh
bib2html: komanda nerasta
bib2html: Kommando nicht gefunden.
bib2html: kommandot finns inte
bib2html: komut yok
bib2html: nie znaleziono polecenia
bib2html: níor aimsíodh an t-ordú
bib2html: no se encontró la orden
bib2html: no s'ha trobat l'ordre
bib2html: opdracht niet gevonden
bib2html: parancs nem található
bib2html: perintah tidak ditemukan
bib2html: príkaz nenájdený
bib2html: příkaz nenalezen
bib2html: команда не найдена
bib2html: командата не е открита
bib2html: 命令找不到
bib2html: コマンドが見つかりません