Comment 12 for bug 60231

First, check to see if your issue is actually caused by this bug. To do this, see if your card shows up when you run: lspci

eg, I get: 02:00.0 Network controller: Intersil Corporation ISL3890 [Prism GT/Prism Duette]/ISL3886 [Prism Javelin/Prism Xbow] (rev 01)

If it shows up, you just need to configure it properly - search ubuntuforums.org for the model name of your card.

If it does not show up, it might be due to this bug. This issue is fixed for me in edgy since the fix was commited (2.6.17-10.33), but to work around a dodgy BIOS you can try adding 'pci=bios' or 'pci=conf1' to your kernel cmdline by either adding it in grub on boot (search forums for this - basically press 'Esc' and 'e' to edit the options) or editing /boot/grub/menu.lst, looking for the kopt= line and adding the option:
[...]
## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=... ro pci=conf1
[...]
Then run: sudo update-grub
...and it should work on reboot.

If it does not, something else is going on - search for another bug here or open your own bug, providing as much info as you can (see above for the kind of info).