Public bug reported:

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.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: grub server

** Description changed:

  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:
+ 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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https://bugs.launchpad.net/bugs/1857789

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

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