Chosen ubuntu partition bootloader on GPT disk

[Petr Menšík]

Because I already have Fedora installed on my computer, I have chosen partition of Ubuntu to contain boot loader. I expected to boot ubuntu by chain loading from Fedora. I want my bootloader untouched on disk loading. Had my disk custom assigned, partitions kept.

However, during installation, grub installation failed. I selected continue without grub installation. But that failed whole installation.

Expected warning to show, telling I have to fix bootloading manually or retry. It might also stop me from choosing partition as bootloader, if GPT cannot support it.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 25 08:54:52 2020
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 LANGUAGE=cs_CZ.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=cs_CZ.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: grub-installer
UpgradeStatus: No upgrade log present (probably fresh install)