karma_helper: 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/karma_helper - from package: karma-tools

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

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