packf: 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/mh/packf - from package: nmh

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

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