[Bug 1912547] [NEW] cannot install ubuntu on luks btrfs uefi multiboot sda

[VS]

Public bug reported:

tried to follow this
https://teejeetech.in/2020/09/05/linux-multi-boot-with-refind/ 
https://teejeetech.medium.com/linux-multiboot-with-btrfs-luks-and-efi-part-2-7b0896c03cce

set sda as boot device, sda3 efi partition for boot and  boom got this
bug. My root is btrfs. I already have refind and manjaro installed on
existing luks btrfs root filesystem as per the links i followed.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.15
ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CasperVersion: 1.394.3
Date: Wed Jan 20 18:35:10 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
LiveMediaBuild: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic ubiquity-18.04.14.15 ubuntu

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https://bugs.launchpad.net/bugs/1912547

Title:
  cannot install ubuntu on luks btrfs uefi multiboot sda

Status in grub-installer package in Ubuntu:
  New

Bug description:
  tried to follow this
  https://teejeetech.in/2020/09/05/linux-multi-boot-with-refind/ 
  https://teejeetech.medium.com/linux-multiboot-with-btrfs-luks-and-efi-part-2-7b0896c03cce

  set sda as boot device, sda3 efi partition for boot and  boom got this
  bug. My root is btrfs. I already have refind and manjaro installed on
  existing luks btrfs root filesystem as per the links i followed.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14.15
  ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.16
  Architecture: amd64
  CasperVersion: 1.394.3
  Date: Wed Jan 20 18:35:10 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  LiveMediaBuild: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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