mge-utalk: 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 CentOS possible default full paths are:

/sbin/mge-utalk - from package: nut

You may install the required package with command yum install {package}

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