Kubuntu 19.10 installer crash towards the end of installation

[Tucniak]

I have an existing Ubuntu (gnome) installed using the default LVM+LUKS
I resized the LVs to create a new LV to install Kubuntu for dual boot
the crash happened at the end of installation. the screen went dark, like when teh screensaver kicks in. I pressed a key (don't know which one) and had the crash

kubuntu@kubuntu:~$ lsb_release -rd
Description: Ubuntu 19.10
Release: 19.10

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: ubiquity 19.10.21 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
Uname: Linux 5.3.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CasperVersion: 1.427
CurrentDesktop: KDE
Date: Thu Dec 19 21:05:38 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Dec 19 21:04:47 kubuntu /plugininstall.py: Traceback (most recent call last):
Dec 19 21:04:47 kubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 251, in run
Dec 19 21:04:47 kubuntu /plugininstall.py: self.apt_clone_restore()
Dec 19 21:04:47 kubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1495, in apt_clone_restore
Dec 19 21:04:47 kubuntu /plugininstall.py: restore_cmd, preexec_fn=install_misc.debconf_disconnect)
Dec 19 21:04:47 kubuntu /plugininstall.py: File "/usr/lib/python3.7/subprocess.py", line 363, in check_call
Dec 19 21:04:47 kubuntu /plugininstall.py: raise CalledProcessError(retcode, cmd)
Dec 19 21:04:47 kubuntu /plugininstall.py: subprocess.CalledProcessError: Command '['apt-clone', 'restore-new-distro', '/target/ubiquity-apt-clone/apt-clone-state-kubuntu.tar.gz', 'eoan', '--destination', '/target']' returned non-zero exit status 1.
Dec 19 21:04:47 kubuntu /plugininstall.py: