Hopefully someone can help an absolute beginner!

I'm not able to receive a download speed of more than 56 KB/s using Ubuntu Release 12.04 (precise) 32-bit, Kernel Linux 3.2.0-41-generic-pae with the Intel Centrino Wireless-N 1030 interface on a Dell XPS L502X laptop. The broadband tariff is unlimited and I'm experiencing this slow speed with the laptop connected to the mains so power management shouldn't be throttling the speed.

When I ran the diagnostic for my router it tells me it's downloading up to 511 KB/s.

If I'm running Windows 8 free trail version (both OS are running on same laptop) I'm able to receive roughly 511 KB/s and if I tether the laptop to my mobile i can download over 511 KB/s, using wi fi in each instance.

Would really appreciate knowing how to solve the slow download speed issue cause compared to windoze this OS rocks!!!