idl2deb: 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/idl2deb - from package: wireshark-dev

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

Error in other languages:
idl2deb: bevel nie gevind nie
idl2deb: comandă negăsită
idl2deb: comando não encontrado
idl2deb: commande introuvable
idl2deb: command not found
idl2deb: käsku ei ole
idl2deb: không tìm thấy lệnh
idl2deb: komanda nerasta
idl2deb: Kommando nicht gefunden.
idl2deb: kommandot finns inte
idl2deb: komut yok
idl2deb: nie znaleziono polecenia
idl2deb: níor aimsíodh an t-ordú
idl2deb: no se encontró la orden
idl2deb: no s'ha trobat l'ordre
idl2deb: opdracht niet gevonden
idl2deb: parancs nem található
idl2deb: perintah tidak ditemukan
idl2deb: príkaz nenájdený
idl2deb: příkaz nenalezen
idl2deb: команда не найдена
idl2deb: командата не е открита
idl2deb: 命令找不到
idl2deb: コマンドが見つかりません