xbuffy: 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/xbuffy - from package: xbuffy

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

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