average_labels: 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/lib/cmtk/bin/average_labels - from package: cmtk

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

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