reportbug-ng: 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/reportbug-ng - from package: reportbug-ng

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

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