avg_checkpolygonspeed: 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/avg_checkpolygonspeed - from package: python-libavg

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

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