Xubuntu 16.04.1 amd64 install (ubiquity) fail

[henczati]

Installing from daily image @2016-11-20.
Target partition: DOS part. table, cca. 13.5 GiB Logical ext4 in a cca. 140 GiB Extended part.
Installer progressbar said "installing" and pop-up about fail came at around 30%.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63.3
ProcVersionSignature: Ubuntu 4.4.0-49.70-generic 4.4.30
Uname: Linux 4.4.0-49-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CasperVersion: 1.376.2
Date: Mon Nov 21 18:13:36 2016
InstallCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz.efi file=/cdrom/preseed/xubuntu.seed boot=casper only-ubiquity root=UUID= debian-installer/language=en keyboard-configuration/layoutcode= iso-scan/filename=/xenial-x_16.04.1-d6__2016-11-20T01-34.iso quiet splash ---
LiveMediaBuild: Xubuntu 16.04.1 LTS "Xenial Xerus" - Beta amd64 (20161120)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)