I've been using Ubuntu 10.10 on my HP Pavilion dv4-1430us Notebook. For some time now, I've been getting these thin green flickering lines at the bottom of my screen. And I've no clue as to what's causing this problem: hardware, battery or graphics card. I even tried "nomodeset" as suggested in some forums, but it wasn't of any help. I'm looking for a way to get rid of this problem.
This sounds very much like a failing connections on the display, rather than a problem with Ubuntu. If you want to make sure, try to replicate the problem when Ubuntu is not booted (e.g. in the BIOS screen).
I don't suggest you open up your laptop, but repair at a local computer store will probably be reasonably cheap. If you can confirm the problem is related to the hardware, talk to a few local repair places to see if they can do anything about it. And just as a small tip: bring your computer, they'll have a much easier time figuring out what it is then.
I Hope I'm wrong (but I don't think I am).