[efi on top o legacy] Installer crash with legacy on disk 1 and efi installation on disk 2

[Jean-Baptiste Lallement]

Test Case.
1. On a 2 disks configuration, do a bios installation on disk 1
2. Boot the installer again with uefi enabled and do a second installation on disk 2
  - Select custom partitioning
  - Create a new partition
  - Allocate the free space to /
  - Install bootloader on sda1
3. Proceed with installation

Result
grub installer crashes because the ESP is not created

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.6
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CasperVersion: 1.394
Date: Sun Jul 29 09:17:07 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper ---
LiveMediaBuild: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)

[Phillip Susi (psusi)]

How is this not an exact duplicate of bug #1783996?

[Phillip Susi (psusi)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1766945, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.