qavg: 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/qavg - from package: loki

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

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