slow internet Problem on kubuntu 9.10 AMD x64

slow internet Problem on kubuntu 9.10 AMD x64

I've recently installed kubuntu 9.10 AMD x64, on an HP 6830s. The installation went smoothly, with only one problem: when I try to use the internet, it's incredibly slow. I couldn't install Firefox or anything that requires the internet. I have tried most of the solutions I found through Google, but none of them solves the problem.