depqbf: 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/depqbf - from package: depqbf

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

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