The only solution is to install a version of Ubuntu older than 12.04 or another distro.I recently bought a new Linksys wireless router and after setting it up with basic WEP security, I tried to logon from my laptop and was successful! So then I tried to connect from my desktop computer that has a wireless USB adapter attached to it and I ended up getting this error message: Fabulous! I checked my settings on the wireless router to make sure I didn’t accidentally setup certificate security, but found no such thing.I'm trying to test ubuntu on this old laptop I happen to have but I can't get past the boot menu.I choose the option to test ubuntu and when I press enter it freezes. I was trying to get to a menu instead of the graphical "try Ubuntu" screen on a VM and click the x to close that screen and it went into the Ubuntu desktop as if I clicked the "try Ubuntu" option. when you get to the screen that shows Try Ubuntu ..Also, since I was able to connect from my laptop with no problem, it led me to believe it was something wrong with my desktop.After about 30 minutes of fiddling around with various settings, I was able to figure out what the problem was.There's no error messages or anything, I just get stuck on the boot selection screen. just close the window by clicking the X and say yes to canceling the install ... or you may get into the desktop I found the problem.I've tried both 64 bit and 32 bit ubuntu and 2 different types of flash drives (USB 3.0 and 2.0). I know that in Window XP, It gets stuck on "Validating Identity" and never connects to wifi. The laptop CPU (Celeron M360 @1.4GHz with a 400MHz bus speed) does not support PAE, some sort of memory management in the CPU.
Click on the Authentication tab and now uncheck the Enable IEEE 802.1x authentication for this network box.If the box was checked, then that was why you were getting the “unable to find a certificate to log you on to the network” message because Windows is looking for one, but your wireless router is not setup for certificate security. Once I unchecked that box and tried to reconnect to the wireless network, everything worked fine!