dose-challenged: 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/dose-challenged - from package: dose-extra

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

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