Nope.. is your motherboard.. ASROCK AGI board?? Theres is a AGI proprietary asrock technology which causes bugs with kernel 2.6.* see BUG #5807 at kernel.org website.
Now, heres a work around when ubuntu boots first time when it says
"starting hotplug subsystem" quickly press [control]+C and it will skip that part, to continue loading.
when its booted up, after logging in issue
Code:
$ sudo mv /etc/init.d/hotplug /etc/init.d/hotplug-masked
we're just renaming the hotplug file so that it doesn't get causing hangs at boot up. How ever the catch is you (probably.. not sure) wont get sound working. Its a problem with the kernel 2.6.* series.