Public bug reported:

I was requested by wxl/Walter to re-run calamares installer using -d to gain 
more detail on failures related to 
https://bugs.launchpad.net/ubuntu/+source/calamares/+bug/1864787
https://bugs.launchpad.net/ubuntu/+source/calamares/+bug/1864791

Please refer to command #10 & #11 for details on what I did... or in summary
---
Attempt to re-install Lubuntu 20.04 daily over prior Lubuntu 20.04 image.
sda8 is /home for prior install; is being re-used with NO-FORMAT.
sda9 was / and it'll be re-formatted.

I firstly ran QA-test install and got error 1864787. Any notes will be
on iso.qa and in on other bug report.

I then exited calamares but did NOT reboot
(*) I opened KDE Partition to ensure no partitions were mounted; I noted that 
sda9 now showed as UNKNOWN type (as it had before; this bug will now occur). No 
partitions (inc. swap) were mounted so nothing was done in KDE Partition 
Manager and I exited

I re-ran the (*) step but this time used `sudo -E calamares -d` where I
noted a SegFault.. I hadn't noticed that before (but wasn't usually
running calamares from term so maybe it was just me that didn't notice).
Nothing unusual appeared on screen.

ProblemType: Crash
DistroRelease: Ubuntu 20.04
Package: calamares 3.2.20-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-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: 2.20.11-0ubuntu18
Architecture: amd64
CasperVersion: 1.441
CurrentDesktop: LXQt
Date: Tue Mar  3 15:43:35 2020
ExecutablePath: /usr/bin/calamares
LiveMediaBuild: Lubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200302)
ProcCmdline: calamares -d
RelatedPackageVersions:
 calamares-settings-ubuntu-common 1:20.04.2
 calamares-settings-lubuntu       1:20.04.2
 xfsprogs                         5.3.0-1ubuntu1
 btrfs-progs                      5.4.1-2
SegvAnalysis: Skipped: missing required field "Disassembly"
Signal: 11
SourcePackage: calamares
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

** Affects: calamares (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-crash focal need-amd64-retrace

** Information type changed from Private to Public

-- 
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https://bugs.launchpad.net/bugs/1865817

Title:
  lubuntu 20.04 debugging `sudo -E calamares -d` requested caused
  segfault, unable to wipe sda9 fs

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