bpfc: 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/sbin/bpfc - from package: netsniff-ng

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

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