Installing Ubuntu 16.04.1 onto Dell Yoga with patched Win 10 uefi boot setup:The 'grub-efi-amd64-signed' package failed to install into /target/.

[Dave Gawley]

dual boot (grub primary chaining to Windows when Win 10 was selected) was working fine until fresh Windows 10 Education version was patched.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.2 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CasperVersion: 1.376
Date: Sun Sep 4 15:23:15 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash oem-config/enable=true ---
LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Dave Gawley (dlgawley-8)]

the above comment should have said "until the unpatched Windows 10 Education vesion was patched"

[Phillip Susi (psusi)]

Your EFI system partition is corrupt; you will need to repair it with windows' chkdsk.