lightspark: 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/lightspark - from package: lightspark

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

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