netmrg-gatherer: 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/netmrg-gatherer - from package: netmrg

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

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