k2f: 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/k2f - from package: alliance

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

Error in other languages:
k2f: bevel nie gevind nie
k2f: comandă negăsită
k2f: comando não encontrado
k2f: commande introuvable
k2f: command not found
k2f: käsku ei ole
k2f: không tìm thấy lệnh
k2f: komanda nerasta
k2f: Kommando nicht gefunden.
k2f: kommandot finns inte
k2f: komut yok
k2f: nie znaleziono polecenia
k2f: níor aimsíodh an t-ordú
k2f: no se encontró la orden
k2f: no s'ha trobat l'ordre
k2f: opdracht niet gevonden
k2f: parancs nem található
k2f: perintah tidak ditemukan
k2f: príkaz nenájdený
k2f: příkaz nenalezen
k2f: команда не найдена
k2f: командата не е открита
k2f: 命令找不到
k2f: コマンドが見つかりません