b2f: 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/b2f - from package: alliance

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

Error in other languages:
b2f: bevel nie gevind nie
b2f: comandă negăsită
b2f: comando não encontrado
b2f: commande introuvable
b2f: command not found
b2f: käsku ei ole
b2f: không tìm thấy lệnh
b2f: komanda nerasta
b2f: Kommando nicht gefunden.
b2f: kommandot finns inte
b2f: komut yok
b2f: nie znaleziono polecenia
b2f: níor aimsíodh an t-ordú
b2f: no se encontró la orden
b2f: no s'ha trobat l'ordre
b2f: opdracht niet gevonden
b2f: parancs nem található
b2f: perintah tidak ditemukan
b2f: príkaz nenájdený
b2f: příkaz nenalezen
b2f: команда не найдена
b2f: командата не е открита
b2f: 命令找不到
b2f: コマンドが見つかりません