lubuntu focal.2 calamares failed to install bootloader (fd0)

[Chris Guiver]

Lubuntu 20.04.2 daily QA-test install failure
- dell [optiplex] 755 (c2d-e6850, 5gb, amd/ati radeon rv516/x1300/x1550)

testcase: custom partitioning with separate /home
purpose is to look for https://bugs.launchpad.net/calamares/+bug/1864787
SDA9 for /, re-use sda8 as /home

installation appeared to be nearing completion, then I heard the floppy drive start up, it remained that way a bit then error window appeared :-
---
Boost.Python error in job "bootloader".
Command 'grub-install --target=i386-pc --recheck --force /dev/fd0' returned non-zero exit status 1.
Installing for i386-pc platform. grub-install: error: unable to identify a filesystem in hostdisk//dev/fd0; safety check can't be performed.

Traceback:
File "/usr/lib/x86_64-linux-gnu/calamares/modules/bootloader/main.py", line 457, in run
    prepare_bootloader(fw_type)

  File "/usr/lib/x86_64-linux-gnu/calamares/modules/bootloader/main.py", line 429, in prepare_bootloader
    install_grub(efi_directory, fw_type)

  File "/usr/lib/x86_64-linux-gnu/calamares/modules/bootloader/main.py", line 336, in install_grub
    check_target_env_call([libcalamares.job.configuration["grubInstall"],

  File "<string>", line 5, in <module>
---

I suspect this is duplicate of https://bugs.launchpad.net/ubuntu/+source/calamares/+bug/1873128, I'll confirm and mark as such when I can (or amend this to reflect full situation)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: calamares 3.2.20-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-62.70-generic 5.4.78
Uname: Linux 5.4.0-62-generic x86_64
.etc.calamares.modules.finished.conf:
 ---
 restartNowMode: user-checked
 restartNowCommand: "systemctl -i reboot"
.etc.calamares.modules.partition.conf:
 efiSystemPartition: "/boot/efi"
 enableLuksAutomatedPartitioning: true
 userSwapChoices: none
 drawNestedPartitions: true
 defaultFileSystemType: "ext4"
.etc.calamares.modules.shellprocess_logs.conf:
 ---
 dontChroot: true
 timeout: 30
 script:
     - calamares-logs-helper @@ROOT@@
.etc.calamares.modules.unpackfs.conf:
 ---
 unpack:
     - source: "/cdrom/casper/filesystem.squashfs"
         sourcefs: "squashfs"
         destination: ""
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445.1
CurrentDesktop: LXQt
Date: Fri Jan 15 17:13:56 2021
LiveMediaBuild: Lubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20210114)
RelatedPackageVersions:
 calamares-settings-ubuntu-common 1:20.04.2
 calamares-settings-lubuntu 1:20.04.2
 xfsprogs 5.3.0-1ubuntu2
 btrfs-progs 5.4.1-2
SourcePackage: calamares
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1911854