[Bug 1783914] [NEW] Grub2 fails to install dualboot Windows 10

[David]

Public bug reported:

I am relatively new to Linux so forgive me if I make a mistake. I
decided recently that I would prefer to start using Ubuntu Mate 18.04 as
my main OS and have a small Windows 10 partition solely for Steam and
gaming. I installed windows with a 55Gb partition (and its auto created
hidden one) Then for the remaining space I set 4Gb swap and then the
remaining 180Gb for Ubuntu. During the install everything appears to be
working fine until I get an error that roughly states " grub failed to
install...cannot boot without grub". I have been playing around with
different Ubuntu variants and never receive this error if I do a
complete wipe of the disk and install only Linux. Is the boot loader
messed up because of windows? I'm not sure what I should do to fix this,
any help is appreciated. Thanks!

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: Thu Jul 26 20:54:12 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed boot=casper only-ubiquity quiet splash ---
LiveMediaBuild: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 LC_NUMERIC=C.UTF-8
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 ubuntu-mate

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https://bugs.launchpad.net/bugs/1783914

Title:
  Grub2 fails to install dualboot Windows 10

Status in grub-installer package in Ubuntu:
  New

Bug description:
  I am relatively new to Linux so forgive me if I make a mistake. I
  decided recently that I would prefer to start using Ubuntu Mate 18.04
  as my main OS and have a small Windows 10 partition solely for Steam
  and gaming. I installed windows with a 55Gb partition (and its auto
  created hidden one) Then for the remaining space I set 4Gb swap and
  then the remaining 180Gb for Ubuntu. During the install everything
  appears to be working fine until I get an error that roughly states "
  grub failed to install...cannot boot without grub". I have been
  playing around with different Ubuntu variants and never receive this
  error if I do a complete wipe of the disk and install only Linux. Is
  the boot loader messed up because of windows? I'm not sure what I
  should do to fix this, any help is appreciated. Thanks!

  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: Thu Jul 26 20:54:12 2018
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu-mate.seed boot=casper only-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  ProcEnviron:
   LANGUAGE=en_US.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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