[Bug 1768621] Re: Installation of Ubuntu 18.04 Desktop installation crashes when unable to write Grub

[Daniel]

Note - I just performed the planned retry and everything installed
perfectly.

To summarize:
1) Shut down and disconnected power and data from both primary HDD containing Win7, and the external NTFS drive.
2) Rebooted and left it. This eventually reverted to the Live USB boot disk on the flash drive, which is not what I wanted. Shut down, pulled the Live disk and rebooted. Immediately received a "No Boot Partition Found" error.
3) Rebooted again, this time to the Live USB disk and performed a raw installation. During partitioning, Ubuntu asked if I wanted to install the new OS alongside the already-existing 18.04 instance (I assume this was from the leftover files from the previous failed attempt), erase Ubuntu and overwrite, or format the entire disk and write.
4) I chose to allow Ubuntu Installer to use the entire disk for the root partition. Note - It did not create a swap partition for some reason, but instead used all 250GB for a single root partition.
5) The installer, after formatting and partitioning, just plain worked without any extra complaints.

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https://bugs.launchpad.net/bugs/1768621

Title:
  Installation of Ubuntu 18.04 Desktop installation crashes when unable
  to write Grub

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Attempting to install Ubuntu Desktop 18.04 to a second HDD (primary is
  reserved for Windows 7 Pro, and I don't want to touch it with a
  partition manager). Reserved 220GB of hard disk space for the root
  partition, and another 30GB for swap. The installer was able to get
  nearly all the way through the installation process (according to the
  progress bar, probably 80%) when suddenly it crashed and notified me
  that writing (I assume) grub to the MBR had failed and that the
  installer was not going to continue.

  No reboot has been attempted yet, but my plan is to shut down,
  disconnect unused drives (Win7, external HDD), and attempt to boot out
  of the 250GB drive as is. If this fails, I'll attempt another install
  with extraneous drives still disconnected and allowing the installer
  to automatically determine the ideal partition setup.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.14 [modified: lib/partman/automatically_partition/question]
  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 May  2 11:48:11 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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