I had this problem too as i reported in bug 289754 . Stable kernel fixes this issues from 2.6.27.5 and 2.6.28-rc3 Today i have installed 2.6.27-10-generic that solves the issue :)
-- 2.6.27 SATA drives not accessible at boot time, 2.6.24 working https://bugs.launchpad.net/bugs/294123 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
