Public bug reported:

Update to grub 2.04-1ubuntu44 causes system to fail to reboot properly.

#lsb_release -a

LSB Version:    
core-9.20170808ubuntu1-noarch:printing-9.20170808ubuntu1-noarch:security-9.20170808ubuntu1-noarch
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.5 LTS
Release:        18.04
Codename:       bionic

Automatic software updater updated grub with target grub 2.04-1ubuntu44

#cat /var/log/apt/history.log
Start-Date: 2021-05-08  18:11:35
Commandline: aptdaemon role='role-commit-packages' sender=':1.62'
Install: grub-efi-amd64-signed:amd64 (1.167~18.04.1+2.04-1ubuntu44, automatic)
Upgrade: update-notifier-common:amd64 (3.192.1.9, 3.192.1.10), 
libsystemd0:amd64 (237-3ubuntu10.46, 237-3ubuntu10.47), libsystemd0:i386 
(237-3ubuntu10.46, 237-3ubuntu10.47), grub-common:amd64 (2.02-2ubuntu8.21, 
2.02-2ubuntu8.23), librbd1:amd64 (12.2.13-0ubuntu0.18.04.6, 
12.2.13-0ubuntu0.18.04.7), grub2-common:amd64 (2.02-2ubuntu8.21, 
2.02-2ubuntu8.23), udev:amd64 (237-3ubuntu10.46, 237-3ubuntu10.47), 
grub-pc:amd64 (2.02-2ubuntu8.21, 2.02-2ubuntu8.23), libudev1:amd64 
(237-3ubuntu10.46, 237-3ubuntu10.47), libudev1:i386 (237-3ubuntu10.46, 
237-3ubuntu10.47), grub-pc-bin:amd64 (2.02-2ubuntu8.21, 2.02-2ubuntu8.23), 
grub-efi-amd64-bin:amd64 (2.02-2ubuntu8.21, 2.04-1ubuntu44), libudev-dev:amd64 
(237-3ubuntu10.46, 237-3ubuntu10.47), systemd-sysv:amd64 (237-3ubuntu10.46, 
237-3ubuntu10.47), libpam-systemd:amd64 (237-3ubuntu10.46, 237-3ubuntu10.47), 
systemd:amd64 (237-3ubuntu10.46, 237-3ubuntu10.47), libnss-systemd:amd64 
(237-3ubuntu10.46, 237-3ubuntu10.47), update-notifier:amd64 (3.192.1.9, 
3.192.1.10), librados2:amd64 (12.2.13-0ubuntu0.18.04.6, 
12.2.13-0ubuntu0.18.04.7)
End-Date: 2021-05-08  18:14:04

After subsequent shutdown, system fails to reboot correctly, leaving me
at grub> prompt.

System is UEFI
HD is partitioned with ESP partition and encrypted partition.
Encrypted partition contains lvm volumes (lvm-boot, lvm-root, lvm-home, etc)

using grub> ls to find encrypted partition and performing grub>
cryptomount makes lvm volumes accessible. Setting linux and initrd to
appropriate files in lvm-boot allows subsequent successful boot.

Upgrade procedure appears to have lost previous configuration.

** Affects: lubuntu-meta (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: grub

** Description changed:

- Update to grub 2.04-1ubuntu44 cause system to fail to reboot properly.
+ Update to grub 2.04-1ubuntu44 causes system to fail to reboot properly.
  
  #lsb_release -a
  
  LSB Version:  
core-9.20170808ubuntu1-noarch:printing-9.20170808ubuntu1-noarch:security-9.20170808ubuntu1-noarch
  Distributor ID:       Ubuntu
  Description:  Ubuntu 18.04.5 LTS
  Release:      18.04
  Codename:     bionic
  
  Automatic software updater updated grub with target grub 2.04-1ubuntu44
  
  #cat /var/log/apt/history.log
  Start-Date: 2021-05-08  18:11:35
  Commandline: aptdaemon role='role-commit-packages' sender=':1.62'
  Install: grub-efi-amd64-signed:amd64 (1.167~18.04.1+2.04-1ubuntu44, automatic)
  Upgrade: update-notifier-common:amd64 (3.192.1.9, 3.192.1.10), 
libsystemd0:amd64 (237-3ubuntu10.46, 237-3ubuntu10.47), libsystemd0:i386 
(237-3ubuntu10.46, 237-3ubuntu10.47), grub-common:amd64 (2.02-2ubuntu8.21, 
2.02-2ubuntu8.23), librbd1:amd64 (12.2.13-0ubuntu0.18.04.6, 
12.2.13-0ubuntu0.18.04.7), grub2-common:amd64 (2.02-2ubuntu8.21, 
2.02-2ubuntu8.23), udev:amd64 (237-3ubuntu10.46, 237-3ubuntu10.47), 
grub-pc:amd64 (2.02-2ubuntu8.21, 2.02-2ubuntu8.23), libudev1:amd64 
(237-3ubuntu10.46, 237-3ubuntu10.47), libudev1:i386 (237-3ubuntu10.46, 
237-3ubuntu10.47), grub-pc-bin:amd64 (2.02-2ubuntu8.21, 2.02-2ubuntu8.23), 
grub-efi-amd64-bin:amd64 (2.02-2ubuntu8.21, 2.04-1ubuntu44), libudev-dev:amd64 
(237-3ubuntu10.46, 237-3ubuntu10.47), systemd-sysv:amd64 (237-3ubuntu10.46, 
237-3ubuntu10.47), libpam-systemd:amd64 (237-3ubuntu10.46, 237-3ubuntu10.47), 
systemd:amd64 (237-3ubuntu10.46, 237-3ubuntu10.47), libnss-systemd:amd64 
(237-3ubuntu10.46, 237-3ubuntu10.47), update-notifier:amd64 (3.192.1.9, 
3.192.1.10), librados2:amd64 (12.2.13-0ubuntu0.18.04.6, 
12.2.13-0ubuntu0.18.04.7)
  End-Date: 2021-05-08  18:14:04
  
  After subsequent shutdown, system fails to reboot correctly, leaving me
  at grub> prompt.
  
  System is UEFI
  HD is partitioned with ESP partition and encrypted partition.
  Encrypted partition contains lvm volumes (lvm-boot, lvm-root, lvm-home, etc)
  
  using grub> ls to find encrypted partition and performing grub>
  cryptomount makes lvm volumes accessible. Setting linux and initrd to
  appropriate files in lvm-boot allows subsequent successful boot.
  
  Upgrade procedure appears to have lost previous configuration.

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https://bugs.launchpad.net/bugs/1927853

Title:
  Update to grub 2.04-1ubuntu44 breaks booting

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