reportbug: 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 - from package: reportbug

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

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