xfpack: 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/xfpack - from package: xfe

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

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