The installer crashes on new installation

[Hauke]

The installer crashes with the following message:
"trying to overwrite '/etc/console-setup/compose.ISO-8859-11.inc', which is also in package console-setup 1.123",
afterwards there's a window that suggests to create a bug report after the window is closed, but it's not possible to close that window.

This bug report was created by "ubuntu-bug ubiquity"

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.18.8.9 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 3.19.0-25.26~14.04.1-lowlatency 3.19.8-ckt2
Uname: Linux 3.19.0-25-lowlatency x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CasperVersion: 1.340.2
CurrentDesktop: XFCE
Date: Mon Nov 9 14:14:47 2015
InstallCmdLine: initrd=/casper/initrd.lz file=/cdrom/preseed/ubuntustudio.seed boot=casper quiet splash -- BOOT_IMAGE=/casper/vmlinuz
LiveMediaBuild: Ubuntu-Studio 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Nov 9 12:29:46 ubuntu-studio /plugininstall.py: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Nov 9 12:29:46 ubuntu-studio /plugininstall.py:

[Ubuntu Foundations Team Bug Bot (crichton)]

Reviewing your installation log file it appears that your installation media contains some extra data which is causing the installation to fail. The standard Ubuntu installation media (and that of supported derivatives) does not include this data and will not fail in this way, so it must be an issue with the way your installation media was prepared. Subsequently, this bug report is Invalid. However, to resolve the issue should try fully erasing the USB drive which contains the installer before recreating it. Thanks and good luck!

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]