Kubuntu 20.04 installer crashed

[Gabriel T]

1. lsb_release -rd
Description: Ubuntu 20.04 LTS
Release: 20.04

2. -

3. I was expecting that the install completes and I'll be asked to restart into Kubuntu 20.04

4. The installer stopped with a message letting me know it crashed and advising to run "ubuntu-bug ubiquity"

I tried installing Kubuntu 20.04 because Kubuntu 20.04.1 installer failed the same way. I tried
- no updates during install
- no 3rd party software
- disconnected from the network

I tried installing it on the same disk I had a Kubuntu 20.04.1 got through updating 19.10, then 20.04. Besides the old EFI and root partitions (which I deleted), on the disk there were two more storage (no operating system) partitions.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity 20.04.15
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.445
CurrentDesktop: KDE
Date: Fri Sep 25 23:03:55 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)