Public bug reported:

I am installing Ubuntu 19.10 on my new computer, keeping Windows 10 as 
dual-boot. I've previously disabled secure-boot and settled legagy boot instead 
of UEFI.
I've manually partitioned my free disk space with LVM and an EXT4 root 
partition. At the end of the installation process, i get an error when trying 
to write the boot loader (grub-install). I've tried both whole disk device and 
first partition (EFI system, already installed with Windows).

While still running from installation usb key, i tried to manually run
"sudo grub-install /dev/nvme0n1p1" which gives something like "unable to
obtain canonical path to /cow".

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubiquity 19.10.21
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CasperVersion: 1.427
Date: Thu Oct 17 23:20:50 2019
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed only-ubiquity 
initrd=/casper/initrd quiet splash --- debian-installer/language=fr 
keyboard-configuration/layoutcode?=fr keyboard-configuration/variantcode?=oss
LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug eoan ubiquity-19.10.21 ubuntu

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https://bugs.launchpad.net/bugs/1848599

Title:
  unable to install grub with Win10 dual boot

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