fiesty

I have Ubuntu 7.4 (Fiesty Fawn) installed and i am unable to install softwares,games.etc When ever i tried to install any application via Synaptic Package Manager then it gives me an error(See the screenshot) Earlier i was able to install the applications Please help

Hey Guys, Ubuntu 7.04 was released just around an Hour Ago. *www.ubuntu.com/ is near dead and *releases.ubuntu.com/feisty/ is also Very Slow. And Even their Mirrors. So Better Get it from Torrents, I've Mirrored the Official Torrents Here. Desktop CD...