[Bug 1857789] Re: Ubuntu Server 19.10 Installer immediately boots to GRUB rescue prompt.

[Michael Hudson-Doyle]

** Changed in: subiquity
       Status: New => Incomplete

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Title:
  Ubuntu Server 19.10 Installer immediately boots to GRUB rescue prompt.

Status in subiquity:
  Incomplete
Status in subiquity package in Ubuntu:
  New

Bug description:
  I am attempting to install Ubuntu Server on a Dell Poweredge R710
  server.  There is a single RAID-5 volume group.  This is a similar
  hardware configuration to other servers I have successfully deployed
  (with older releases, all are LTS).  I am booting into Legacy mode,
  not UEFI.

  I have downloaded the latest Ubuntu Server 19.10 installer as of
  12/22/2019.  When installing the OS using the default options in the
  GUI, the install completes "successfully" but immediately boots to
  GRUB rescue.  When going through the installer choosing to update the
  installer as prompted, again the system boots to GRUB rescue.  All
  partitioning is done accepting the defaults.

  If I download the most up to date Ubuntu 18.04.3 LTS installer, the
  system installs and boots fine.  Packages update and everything is
  peachy.  If I upgrade to the latest release using do-release-upgrade,
  the upgrade "completes" successfully, but then immediately boots to
  GRUB rescue.

  I can boot into a live environment and chroot into the system and it
  works fine.  My installs, in testing, accept all defaults especially
  in terms of those related to partitioning.

  I am not very experienced working in GRUB, so everything after this comes from these guides:
  https://askubuntu.com/questions/232215/stuck-in-grub-rescue-mode
  https://www.howtoforge.com/tutorial/repair-linux-boot-with-grub-rescue/
  https://help.ubuntu.com/community/Grub2/Troubleshooting

  When I ls, I get the following:
  (hd0) (hd0,gpt2) (hd0,gpt1)

  If I do "ls (hd0,gpt2)/" I get the contents of my root file system.
  Inside here, /boot and /boot/grub appear fully populated.

  If I do "ls (hd0,gpt1)/" I get "Error, unknown file system".

  When I do "set" I see the following relevant entries:
  prefix=(hd0,gpt2)/boot/grub
  root=hd0,gpt2

  These appear to be correct.  If I do the following, I can get the
  system to boot to initramfs prompt but not the actual system:

  insmod normal
  normal
  insmod linux
  linux /vmlinuz root=/dev/sda1 ro
  initrd /initrd.img
  boot

  I have verified that the vmlinuz and initrd.img are there.

  At this point as far as I can tell, something in the default
  configuration of Ubuntu Server 19.10 renders the OS un-bootable
  through GRUB.

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