Ubuntu Bionic VirtualBox-Ubuntu Disco Ubiquity fails

[Patrick Vavrina]

Xubuntu 19.04 development branch installation failed on Ubuntu 18.04.1 LTS in VirtualBox 5.2.10.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: ubiquity 19.04.2
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu14
Architecture: amd64
CasperVersion: 1.399
Date: Sat Nov 17 18:33:01 2018
InstallCmdLine: file=/cdrom/preseed/xubuntu.seed boot=casper initrd=/casper/initrd quiet splash --- maybe-ubiquity
LiveMediaBuild: Xubuntu 19.04 "Disco Dingo" - Alpha amd64 (20181117)
ProcEnviron:
 LANGUAGE=fr_CH.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_CH.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)