[Bug 1315344] Re: Grub install failed on disks with software RAID

[Matthew Hall]

In my case it also failed. I had a precreated series of /dev/md devices
I set up using gdisk.

/dev/md0 for swap, /dev/md1 for root (/), and /dev/md2 for home (/home).

The install died during the grub installation. Now, there is no longer
an Alternate Ubuntu CD with the Debian Installer (which, sadly, after
all these years and all these shiny UIs, still works better than the
Ubuntu one does). So it's pretty tough to work around the problem
either.

I am not sure where to get all of the error logs from the install
because the location of them and most of the behavior of the Ubiquity
installed is undocumented as far as I can tell. It seems like it
segfaulted on me after the failure. I attached the stuff I could find in
/var/log/syslog. But given there's not a lot of decent workarounds I
think this is a pretty severe bug... installers shouldn't segfault...

Jul 28 06:33:02 kubuntu kernel: [ 3143.574987] ubiquity[29163]: segfault
at 70c0000000c ip 00007f04d7379e88 sp 00007fff1862fa08 error 4 in
libQtCore.so.4.8.6[7f04d71eb000+2d8000]

** Attachment added: "Logs from RAID Grub failure and Ubiquity crash"
   https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1315344/+attachment/4164162/+files/ubiquity-log.txt

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https://bugs.launchpad.net/bugs/1315344

Title:
  Grub install failed on disks with software RAID

Status in “grub-installer” package in Ubuntu:
  Confirmed

Bug description:
  I've got two 2TB drives set up with identical partitions, which are combined into RAID1 arrays (five mirrors across the two disks).
  On a free RAID1 I've installed Trusty 64bit from the Desktop installer ("try Ubuntu" first, install mdadm, run mdadm --assemble --scan, then start installer). I then wanted grub to be installed onto /dev/sda and /dev/sdb, but both fail.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubiquity 2.18.7
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.340
  Date: Fri May  2 13:05:29 2014
  InstallCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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