Thanks James, I followed the comments in that bug, changed the 85-lvm2.rules, and verified that the change was present in /lib/udev/rules.d inside the initrd.
I also tried rootdelay=45 and scsi_mod.scan=sync I found in other reports, also no change. I have attached an initram debug trace. Thanks, Yours, Steffen ** Attachment added: "Booting with debug kernel option" https://bugs.launchpad.net/ubuntu/+source/udev/+bug/596554/+attachment/2691542/+files/initramfs.debug -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/596554 Title: Unable to mount root LVM partition To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/596554/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs