[Bug 1851462] [NEW] Grub install failed after installation

[imwithid]

Public bug reported:

Grub fails to install on Lubuntu 18.04 after installation is complete.
It tries to install on dev/sda, which is the live USB disk. When trying
to switch to dev/sdb, installation still fails.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Wed Nov  6 01:03:39 2019
InstallCmdLine: file=/cdrom/preseed/lubuntu.seed noprompt boot=casper iso-scan/filename=/multiboot/lubuntu-18.04-desktop-amd64/lubuntu-18.04-desktop-amd64.iso quiet --
LiveMediaBuild: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic lubuntu ubiquity-18.04.14

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https://bugs.launchpad.net/bugs/1851462

Title:
  Grub install failed after installation

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Grub fails to install on Lubuntu 18.04 after installation is complete.
  It tries to install on dev/sda, which is the live USB disk. When
  trying to switch to dev/sdb, installation still fails.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CasperVersion: 1.394
  Date: Wed Nov  6 01:03:39 2019
  InstallCmdLine: file=/cdrom/preseed/lubuntu.seed noprompt boot=casper iso-scan/filename=/multiboot/lubuntu-18.04-desktop-amd64/lubuntu-18.04-desktop-amd64.iso quiet --
  LiveMediaBuild: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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