customdeb: 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/customdeb - from package: customdeb

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

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