Electronic circuit simulator topic

Hi there, I am an student, and I'm needing an electronical circuit simulator, when using an old wine version I could emulate "Electronics Workbench" but with the latest beta build it seems I can't, (program loads but buttons don't work properly) so I'm searching for a good linux native aplication to simulate electronical circuits, I recently tried oregano, but it just don't have much components, and I'm needing a lil more complete program, so I'm asking here for help. The thing would be a Multisim alternative for Linux, I also used to use Ktechlab, a program I really liked it, very simple useful and complete, but it isn't aviable for this Ubuntu build, and since I'm very "noob" I couldn't compilate it correctly.

Thanks alot.