zinnia_learn: 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/zinnia_learn - from package: zinnia-utils

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

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