Failed to install grub2 bootloader on UEFI (Ubuntu 14.04)

[Luke]

When installing Ubuntu 14.04 at with efi bootloader, it sais grub can't be installed to /target/

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.8.6
ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CasperVersion: 1.340
Date: Sat Jul 4 11:34:22 2015
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash --
LiveMediaBuild: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
ProcEnviron:
 LANGUAGE=de_DE.UTF-8
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)
UpstartUbiquity: debconf: DbDriver "templatedb": /var/cache/debconf/templates.dat is locked by another process: Resource temporarily unavailable

[Phillip Susi (psusi)]

Can you please run apt-cache policy grub-efi-amd64-signed?

[Luke (esuarksakul)]

I just solved this issue by installing Ubuntu like normal, ignoring the warning that the installation progress failed and then used the boot-repair tool of Ubuntu, so I'm not able to run this with the failed presets any more.

[Launchpad Janitor (janitor)]

[Expired for grub-installer (Ubuntu) because there has been no activity for 60 days.]