I just installed, and (checking with 'uname -a' in the terminal' I have the 2.6.27-7-generic #1 SMP Fri Oct 24 06:42:44 UTC 2008 i686 GNU/Linux. I only did the upgrade last night, some 12 hours ago.

Where is the flaw to which you refer? Would this be a flaw on the image/CD installers?

Execute 'sudo dpkg -l linux-image-2.6.27-7-generic' in the terminal. The output should be:

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name Version Description
+++-==============-==============-============================================
ii linux-image-2. 2.6.27-7.15 Linux kernel image for version 2.6.27 on x86

This issue was not discovered yesterday but in early September, see here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/264019 I also find it strange that they made a security update because this is not a security issue at all...

I upgraded from 8.04 to 8.10. The upgrade worked fine and I still had a wireless connection. After 8.10 upgraded to this new kernel release. My wifi connection stopped working. Is there a way to undo this upgrade without having to re-install everything?

@ Torresrg; if you were previously using ndiswrapper things may have gone wrong but the chances are everything will work without it now. However, you might have to fiddle with blacklists and so on, depending how it was originally set up. I suggest going to the Ubuntu forums where there may well be other people with similar problems. If not post for some help. You may possibly have a problem with the held-over local user settings; try making a new account and seeing if the wireless works with that one.

What you can also do if you have the bandwidth is to download the distro, burn to CD and see if it works with your wireless out-of-the-box. If you can't download, you might find a Linux magazine sporting Intrepid.

Good Luck!