I think I am having the same problem with UbuntuStudio 12.04. I see the same symptoms, with the system hanging at various times of startup. Sometimes I even get as far as the login screen. I also saw similar log messages in console 7.
One thing I found is that I can run the live version of UbuntuStudio (with the default low-latency kernel) off of a flash drive if I disconnect my SATA hard drive. If the drive is connected, the live UbuntuStudio won't run. So I was wondering if it might be some sort of bios or SATA driver problem. Here are my bios and motherboard details:
I updated my motherboard firmware, which was supposed to fix some SATA issues, but I still have the problem.
Product Name: 122-CK-NF68
Serial Number: 1
BIOS: Phoenix Technologies, LTD
Version: 6.00 PG
Release Date: 09/04/2008
Does anyone have any thoughts on this? Should I update my bios? I have had trouble finding a free way to do that...
Thanks in advance for any advice.