installation problem robolinux

[Loris Maurizio]

during installation of robolinux cinnamon

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14 [modified: usr/share/ubiquity/apt-setup]
ProcVersionSignature: Ubuntu 4.15.0-50.54-generic 4.15.18
Uname: Linux 4.15.0-50-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CasperVersion: 1.394
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 29 16:44:36 2019
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/linuxmint.seed oem-config/enable=true only-ubiquity boot=casper iso-scan/filename= quiet splash --
LiveMediaBuild: Robolinux_10 18.04 - Release amd64
ProcEnviron:
 LANGUAGE=it_IT.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)