udevd: command not found

Have You tried accessing the binary with the full path?

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/udevd - from package: udev

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

On Debian possible default full paths are:

/sbin/udevd - from package: udev

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