I previously had Ubuntu 10.04 installed on my machine and it worked great for years, until they no longer supported it, so I upgraded to 13.04. I use the GNOME fallback theme (no effects) and have run into some issues:

1. I accidentally removed one of the menus (that showed you the running applications) and I can't figure out how to get it back! Now anytime I minimize something, I can't re-open them. How do I get that menu back?

2. Ubuntu seems to be running SIGNIFICANTLY slower and laggy compared to 10.04. I only have a 1gb of memory in my machine (and 256mb is being taken for graphic reasons). Do I need more memory to run Ubuntu now?

3. I can't get the flux application to run. It's in the processes taking up a lot of the CPU, but it's not running.