umegaya-ddc-ping: 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/umegaya-ddc-ping - from package: umegaya

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

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