imagination: 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/imagination - from package: imagination

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

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