qwbfsmanager: 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/qwbfsmanager - from package: qwbfsmanager

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

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