bib2bib: 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/bib2bib - from package: bibtex2html

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

Error in other languages:
bib2bib: bevel nie gevind nie
bib2bib: comandă negăsită
bib2bib: comando não encontrado
bib2bib: commande introuvable
bib2bib: command not found
bib2bib: käsku ei ole
bib2bib: không tìm thấy lệnh
bib2bib: komanda nerasta
bib2bib: Kommando nicht gefunden.
bib2bib: kommandot finns inte
bib2bib: komut yok
bib2bib: nie znaleziono polecenia
bib2bib: níor aimsíodh an t-ordú
bib2bib: no se encontró la orden
bib2bib: no s'ha trobat l'ordre
bib2bib: opdracht niet gevonden
bib2bib: parancs nem található
bib2bib: perintah tidak ditemukan
bib2bib: príkaz nenájdený
bib2bib: příkaz nenalezen
bib2bib: команда не найдена
bib2bib: командата не е открита
bib2bib: 命令找不到
bib2bib: コマンドが見つかりません