fl-install-demo: 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/fl-install-demo - from package: funkload

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

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