Workaround: I had the same problem doing a default install (ie erase disk and install Ubuntu. No fancy resizing, selecting own partitions etc hence not duplicate of #1766945). But I did select LVM.
Repeated the installation but this time I first ensured I was connected to the internet with a wifi connection and then allowed downloading of updates during the installation. Installation was successful. Possible caveat: I am booting in insecure mode. Not sure whether that makes a difference. ** Description changed: ubuntu 18.04 The 'grub-efi-amd64-signed' package failed to install into / targer. 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 CurrentDesktop: ubuntu:GNOME Date: Fri Apr 27 08:31:02 2018 InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash --- LiveMediaBuild: Ubuntu 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 + 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) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1767259 Title: ubuntu 18.04 The 'grub-efi-amd64-signed' package failed to install into / targer. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1767259/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
