[Bug 1798810] Re: installer crashes after failing to install bootloader

[John Relph]

I had already installed Ubuntu 18.04 LTS on /dev/sdb once, but the grub
install failed, so I was reinstalling it, and so I chose "Erase disk and
install 18.04 LTS over Ubuntu 18.04" or whatever it said on the screen.
The implication was that the installer would auto-partition the 500GB
disk and install Ubuntu into that newly partitioned disk. So I did not
manually partition the disk. I intentionally let the installer overwrite
the previous partitions on the disk.

During the installation, the installer failed to install the bootloader,
so I tried various options from the dialog that was displayed, but they
failed. So I opened a Terminal window and tried manually installing the
bootloader, and that's when I got the "/cow" error. And perhaps that's
when the installer crashed and sent this report.

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https://bugs.launchpad.net/bugs/1798810

Title:
  installer crashes after failing to install bootloader

Status in grub-installer package in Ubuntu:
  Incomplete

Bug description:
  grub-install fails with the following error:
  $ sudo grub-install /dev/sdb
  Installing for i386-pc platform.
  grub-install: error: failed to get canonical path of `/cow'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14.6
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CasperVersion: 1.394
  Date: Fri Oct 19 07:52:04 2018
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd.lz quiet splash ---
  LiveMediaBuild: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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