chuck: 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/chuck - from package: chuck

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

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