Comment 102 for bug 621265

I had the same issue on Ubuntu 10.10 and Mint 10, with PAE/non-PAE kernels, both WUBI/clean installs. The download speed was ~20 times slower than on Windows/previous releases of Ubuntu.

I solved the problem following Eric's suggestion above, by installing the Windows driver (see the mediafire link) - I didn't even bother to blacklist the corresponding kernel module. After reboot, the download speed increased to normal values.

So the issue should be somewhere in the drivers/kernel module. I wanted to clear this out, since I've seen the problem reported on many forums, and the solutions suggested there were strange-to-ridiculous, involving a lot of router related config, disabling DHCP, disabling IPV6, blaming WUBI install, etc.