busyfix: 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/busyfix - from package: undertaker

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

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