[Bug 1762034] Re: Installer crashes at installing grub

[hakuna_matata]

IMHO, we found the reason. Because of new snap packages there were a lot
of existing loop devices when the installer created loop devices for
installing.

So the loop device for installing is /dev/loop10 which is a problem for
grub. The range of supported loop devices is from /dev/loop0 to
/dev/loop9.

Either it is necessary to change the selection /dev/loop[0-9] in

/etc/grub.d/10_linux from package grub-common (maybe also other files)
/etc/grub.d/10_lupin from package lupin-support
/usr/share/lupin-support/grub-mkimage from package lupin-support

or to change the mount sequence or the loop device names for snap
packages.

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https://bugs.launchpad.net/bugs/1762034

Title:
  Installer crashes at installing grub

Status in grub-installer package in Ubuntu:
  Confirmed

Bug description:
  When i try to install Ubuntu 18.04 ISO via WubiEFI, the Installer
  crashes at creating the grub boot menu.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.4 [modified: bin/autopartition-loop bin/user-params]
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  CasperVersion: 1.392
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Apr  7 19:51:47 2018
  InstallCmdLine: BOOT_IMAGE=/ubuntu/install/boot/vmlinuz.efi debian-installer/custom-installation=/ubuntu/install/custom-installation iso-scan/filename=/ubuntu/install/installation.iso automatic-ubiquity noprompt quiet splash boot=casper ro debian-installer/locale=de_DE.UTF-8 keyboard-configuration/layoutcode=de keyboard-configuration/variantcode= -- rootflags=sync
  LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   LC_NUMERIC=C.UTF-8
  SourcePackage: grub-installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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