[Bug 1801247] [NEW] Failed to intstall ubuntu18.04.1/16.04.5 on RSTe raid mode in legacy mode

[seven-wang]

Public bug reported:

Install ubuntu 18.04.1 on RSTe raid5 under Legacy mode, it can detect
MDADM container（Intel/DDF RAID） successfully.Activated MDADM container
and Serial ATA RAID device (screenshot1-3) to go ahead installing. But
it prompted error that unable to install GRUB in /dev/mapper/ubuntu--vg-
root when excuting 'grub-install /dev/mapper/ubuntu--vg-
root'(screenshot4).


Debug
1.Install ubuntu18.04.1 on RSTe raid0 in Legacy mode, issue also exists.
2. Install ubuntu18.04.1/16.04.5 on RSTe raid5 in UEFI mode, issue not exists.
3. Install ubuntu16.04.5 on RSTe raid5 in Legacy mode, it prompted error that mount media failed after booted into kernel(screenshot5), but can go ahead automatically. And it can install Grub successfully, but cannot login to OS after reboot(screebshot6-7).

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "screenshots.jpg"
   https://bugs.launchpad.net/bugs/1801247/+attachment/5208114/+files/screenshot.zip

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https://bugs.launchpad.net/bugs/1801247

Title:
  Failed to intstall ubuntu18.04.1/16.04.5 on RSTe raid mode in legacy
  mode

Status in debian-installer package in Ubuntu:
  New

Bug description:
  Install ubuntu 18.04.1 on RSTe raid5 under Legacy mode, it can detect
  MDADM container（Intel/DDF RAID） successfully.Activated MDADM container
  and Serial ATA RAID device (screenshot1-3) to go ahead installing. But
  it prompted error that unable to install GRUB in /dev/mapper/ubuntu
  --vg-root when excuting 'grub-install /dev/mapper/ubuntu--vg-
  root'(screenshot4).

  
  Debug
  1.Install ubuntu18.04.1 on RSTe raid0 in Legacy mode, issue also exists.
  2. Install ubuntu18.04.1/16.04.5 on RSTe raid5 in UEFI mode, issue not exists.
  3. Install ubuntu16.04.5 on RSTe raid5 in Legacy mode, it prompted error that mount media failed after booted into kernel(screenshot5), but can go ahead automatically. And it can install Grub successfully, but cannot login to OS after reboot(screebshot6-7).

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