[Bug 1783914] Re: Grub2 fails to install dualboot Windows 10

[Phillip Susi]

Your disk is currently partitioned to boot in bios mode, but you booted
the installer in EFI mode. You either need to boot the installer in bios
mode, or partition the disk using GPT and set up an EFI system partition
to install in EFI mode. This will be done for you if you choose the "use
entire disk" guided install option.

** Changed in: grub-installer (Ubuntu)
       Status: New => Invalid

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Title:
  Grub2 fails to install dualboot Windows 10

Status in grub-installer package in Ubuntu:
  Invalid

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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