buffy: 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/buffy - from package: buffy

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

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