cb2bib: 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/cb2bib - from package: cb2bib

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

Error in other languages:
cb2bib: bevel nie gevind nie
cb2bib: comandă negăsită
cb2bib: comando não encontrado
cb2bib: commande introuvable
cb2bib: command not found
cb2bib: käsku ei ole
cb2bib: không tìm thấy lệnh
cb2bib: komanda nerasta
cb2bib: Kommando nicht gefunden.
cb2bib: kommandot finns inte
cb2bib: komut yok
cb2bib: nie znaleziono polecenia
cb2bib: níor aimsíodh an t-ordú
cb2bib: no se encontró la orden
cb2bib: no s'ha trobat l'ordre
cb2bib: opdracht niet gevonden
cb2bib: parancs nem található
cb2bib: perintah tidak ditemukan
cb2bib: príkaz nenájdený
cb2bib: příkaz nenalezen
cb2bib: команда не найдена
cb2bib: командата не е открита
cb2bib: 命令找不到
cb2bib: コマンドが見つかりません