xfbbC: 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/xfbbC - from package: fbb

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

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