As far as I can tell from the log files it looks like mdadm thought there was a software raid array on the disks and then discovered that only one disk was available:
Dec 13 11:45:26 kernel: [ 59.316385] md: md127 stopped. Dec 13 11:45:26 md-devices: mdadm: Container /dev/md/ddf0 has been assembled with 1 drive (out of 2) Dec 13 11:45:26 kernel: [ 59.320712] md: bind<sda> Dec 13 11:45:27 kernel: [ 59.449282] md: md126 stopped. Dec 13 11:45:27 kernel: [ 59.449551] md: bind<sda> Dec 13 11:45:27 kernel: [ 59.451210] md: raid0 personality registered for level 0 Dec 13 11:45:27 md-devices: mdadm: array /dev/md/Virtual now has 1 devices Dec 13 11:45:27 debconf: --> PROGRESS STEP 1 Dec 13 11:45:27 debconf: <-- 0 OK Dec 13 11:45:27 debconf: --> PROGRESS INFO partman/progress/init/lvm-devices Dec 13 11:45:27 debconf: <-- 10 partman/progress/init/lvm-devices does not exist Dec 13 11:45:27 debconf: --> PROGRESS INFO partman/progress/init/fallback Dec 13 11:45:27 kernel: [ 59.451488] bio: create slab <bio-1> at 1 Dec 13 11:45:27 kernel: [ 59.451494] md/raid0:md126: looking at sda Dec 13 11:45:27 kernel: [ 59.451497] md/raid0:md126: comparing sda(142082048) with sda(142082048) Dec 13 11:45:27 kernel: [ 59.451500] md/raid0:md126: END Dec 13 11:45:27 kernel: [ 59.451502] md/raid0:md126: ==> UNIQUE Dec 13 11:45:27 kernel: [ 59.451505] md/raid0:md126: 1 zones Dec 13 11:45:27 kernel: [ 59.451507] md/raid0:md126: FINAL 1 zones Dec 13 11:45:27 kernel: [ 59.451511] md/raid0:md126: too few disks (1 of 2) - aborting! Dec 13 11:45:27 kernel: [ 59.451513] md: pers->run() failed ... ** Changed in: debian-installer (Ubuntu) Status: New => Confirmed ** Changed in: debian-installer (Ubuntu) Importance: Undecided => Medium ** Changed in: debian-installer (Ubuntu) Assignee: (unassigned) => Canonical Foundations Team (canonical-foundations) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/834731 Title: [Dell PowerEdge R810] 'Prunes' fails to mount file system at /dev/sda1 To manage notifications about this bug go to: https://bugs.launchpad.net/hw-labs/+bug/834731/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs